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If, as you say, its acceleration is "constant", then the average is exactly equal to that constant.

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โˆ™ 2009-08-27 17:48:52
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Q: An object has initial velocity in the upward direction a final velocity in the downward direction and undergoes constant acceleration What can you say about its average acceleration?
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Can an object's velocity reverse direction when its acceleration is constant?

Yes, it can, if the initial velocity vector of an object was in opposite direction to its constant acceleration. Example: Anything you toss with your hand has constant acceleration after you toss it ... the acceleration of gravity, directed downward. If you toss it upward, it starts out with upward velocity, which reverses and eventually becomes downward velocity.

Can an object with constant acceleration reverse its direction of travel can it reverse its direction twice?

Sure. Anything you toss with your hand has constant acceleration after you toss it ... the acceleration of gravity, directed downward. If you toss it upward, it starts out with upward velocity, which reverses and eventually becomes downward velocity.

Can an object with a constant acceleration reverse it direction of travel?

Of course. Anything you toss with your hand has constant acceleration after you toss it ... the acceleration of gravity, directed downward. If you toss it upward, it starts out with upward velocity, which reverses and eventually becomes downward velocity.

If you roll a ball up a hill it undergoes what acceleration?

If you roll a ball up a hill it undergoes negative upward and positive downward acceleration.

When acceleration upward or downward direction is taken positivw or negative?

If it is gravitational acceleration then it it is positive in downward and negative in upward direction..if it is not gravitational acceleration then it is depending upon the value of acceleration.

Can the velocity of a body reverse the direction when acceleration is constant?

Yes, it can. A typical example if when you through something up; after a while it will reverse its direction and fall back down again. Acceleration is downward all the time.

How is acceleration due to gravity be zero in a parachute?

At terminal velocity (constant velocity), the acceleration is zero, but prior to that, there is a downward acceleration.

Why is acceleration due to gravity negative?

It is negative if the upwards direction is defined as positive. Acceleration is downward.

Can an object reverse its direction while maintaining a constant acceleration?

I'm pretty sure a cheetah can do that. Newton's first law of motion states that an object at rest will remain at rest and an object in motion at a constant speed will remain in motion in the same direction at the same speed unless acted upon by another external force. This force creates an additional acceleration on the object. I'm thinking of a ball in free fall being stopped by the ground and "bouncing" it is under constant acceleration and until it makes contact with the ground to apply a external force thus an external or additional acceleration. I would say no it can't unless it's mass changes during the reversal of direction. But then that wouldn't be constant acceleration either ========================================= Everybody is overthinking this. A ball tossed straight up has constant downward acceleration, due to gravity. As soon as the downward acceleration eats up the initial upward velocity, the ball peaks, the velocity becomes downward, and the ball starts to drop. Acceleration is constant from the instant the ball leaves the hand.

Does it mean a skydiver is slowing down if the acceleration of the skydiver decreases as falling progresses?

No.Acceleration is a measure of the rate of change of velocity (speed & direction). If acceleration is decreasing (but still above zero) then this means that the rate at which the speed is increasing in this direction is decreasing.As long as the downward acceleration is greater than zero then the skydiver's speed is still increasing.Once terminal velocity is reached then downward acceleration will equal zero (speed is constant).If the downward acceleration falls below zero (as will happen once his parachute is deployed for instance) then this means he is slowing down.

How do the horizontal components of a projectile motion vary from the vertical components?

Horizontal . . . acceleration is zero, speed is constant Vertical . . . acceleration is 'G' downward, speed constantly increases downward

What is the acceleration of falling body at 0.5 seconds?

acceleration of a falling body is 9.8m/s*s and its direction is vertically downward.

How accelerate change when third force act in downward direction?

Then - according to Newton's Second Law - you would have more acceleration downward.

When you throw a ball upwards what happens to its speed while it is going up?

Its speed decreases at a nearly constant rate of decrease in speed. When a body is in motion due to gravitational force alone, it has constant acceleration downward ... the "acceleration due to gravity". If its velocity is upward, and its acceleration is downward, then the result is a decrease in speed.

Can an object with constant acceleration reverse its direcrion?

Yes. For instance, if you throw an object up, then (ignoring air friction) it will have a constant downward acceleration of about 9.8 meters/second squared. After a while, this acceleration will make it go downwards again.

Can a man in a parachute accelerate?

Yes. Acceleration can be positive or negative. When he jumps out of the airplane and is in free fall, he is accelerating in a downward direction, so his acceleration is negative. When he opens his parachute, he accelerates in an upward direction, so his acceleration is positive.

Should acceleration and velocity always have the same direction in a downward motion?

If you are talking about free fall, acceleration due to gravity and velocity will both be negative, until terminal velocity is reached, at which point the falling object is no longer accelerating and has constant negative velocity.

Describe how the velocity and acceleration of an object change as it fell from tall building?

The magnitude of the velocity will increase. The velocity will be downward - and since it increases, the acceleration will be downward. The acceleration doesn't change (it will remain constant at about 9.8 m/sec2), unless air resistance becomes significant.

Projectile motion is constant motion?

Nope, can't agree with that. "Constant motion" means constant speed in a straight line. A projectile keeps moving faster vertically downward, and its path curves downward no matter what direction you launch it. So it fails both tests for constant motion: Its speed and direction both change.

Can speed be zero when acceleration is constant?

Speed (or velocity) can be zero during a period of constant acceleration. Take a ball thrown vertically into the air. From the time it leaves the hand, it is accelerating downwards, that is, against the direction in which it is travelling. There will come a time when the constant downward acceleration causes the ball to be stationary. This is the highest point the ball will reach and from that time onwards, the ball will begin to travel in the opposite direction, i.e. downwards. For the whole time the ball is in the air it will be accelerating downwards at a constant rate due to gravity. The velocity of the ball is changing continually and includes the moment when velocity is zero.

Does constant acceleration properly characterize the motion of a heavy object thrown violently downward from a tall building?

Yes it does. The object's acceleration is still 9.8 meters per second2 downward, regardless of its initial velocity up, down, or sideways.

How gravity and air resistance different?

Gravity has a constant acceleration value (9.8m/s^2) and acts downward always. Air resistance is as its name suggests a force that only acts when an object is moving, and it can act in any direction (always opposite the direction of motion).

If air resistance is neglected what is the motion of an object projected at an angle consists of a uniform downward acceleration combined with what?

a constant horizontal speed

Why does a projectile travel downward in a curved path?

Gravity pulls the projectile downwards. Assuming for simplicity that air resistance is insignificant, the horizontal speed remains constant, while vertically, the projectile accelerates downwards.

What is the direction of acceleration due to gravity in upward motion and downward motion?

Positive in downard direction because in this direction your initial vilocity will be higher then your final velocity. and vice versa (Negative in upward direction)