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If a body slows down to a stop, it has negative acceleration (deceleration), and when it accelerates negatively to a stop, it will have zero velocity.
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What is the velocity if acceleration is zero?
velocity may be zero or may not be zero i.e. if the object may continue to move with uniform velocity.
What is the slope of the body when it moves with uniform velocity?
zero
Can a body have zero velocity and finite acceleration?
Only instantaneously. If an object is being negatively accelerated, it will be slowing down. If the negative acceleration continues to act on the body, it may, at some point have zero velocity because it has come to a stop, but still have the force acting on it. In the next instant, the object will then be accelerated in another direction. This isn't a "trick" answer. It is just offered to explain a situation in mechanics where an object with some initial velocity is experiencing negative acceleration due to some decelerating force. The dynamics are pretty simple and easy to get your head around if you think about them.
Why at the highest point is the change in velocity zero?
Note - the vertical velocity is zero ... there may be considerable horizontal velocity. And vertical velocity is zero because the object is going neither up nor down.
When an object At the highest point there's an instant when the motion is changing from upward to downward then what is its velocity?
At that moment, its vertical velocity is zero. Its horizontal velocity may or may not be zero, i.e., it may be moving sideways as well.
What is the acceleration if velocity is zero?
velocity may be zero or may not be zero i.e. if the object may continue to move with uniform velocity.
What is the velocity if acceleration is zero?
velocity may be zero or may not be zero i.e. if the object may continue to move with uniform velocity.
What is the slope of the body when it moves with uniform velocity?
zero
Can a body have zero velocity and finite acceleration?
Only instantaneously. If an object is being negatively accelerated, it will be slowing down. If the negative acceleration continues to act on the body, it may, at some point have zero velocity because it has come to a stop, but still have the force acting on it. In the next instant, the object will then be accelerated in another direction. This isn't a "trick" answer. It is just offered to explain a situation in mechanics where an object with some initial velocity is experiencing negative acceleration due to some decelerating force. The dynamics are pretty simple and easy to get your head around if you think about them.
Only one force acts on an object cant the object have zero acceleration and or zero velocity?
In classical physics, if a force (e.g. the sum of all forces) acts on a body, the body cannot have zero acceleration (unless the body has infinite mass), since a = F/m. The velocity on the other hand may be zero, since a(t) = v'(t).
Why at the highest point is the change in velocity zero?
Note - the vertical velocity is zero ... there may be considerable horizontal velocity. And vertical velocity is zero because the object is going neither up nor down.
When an object At the highest point there's an instant when the motion is changing from upward to downward then what is its velocity?
At that moment, its vertical velocity is zero. Its horizontal velocity may or may not be zero, i.e., it may be moving sideways as well.
On a speed time graph a horizontal line shows the change in speed is?
A horizontal line parallel to speed axis indicates that the body is moving at a constant speed i.e. it's speed doesn't change with passage of time. The body may have zero or non zero acceleration, but it will always have non zero velocity. But, that doesn't mean that body's velocity is constant and it is not accelerated. For example in uniform circular motion the speed of body remains constant but velocity changes due to change in the direction of motion. Also there is acceleration towards center of circle called centripetal acceleration which changes the direction of velocity. For this acceleration a force should act towards the center called centripetal force. If speed is constant then the force, if present, must act in direction perpendicular to the immediate direction of motion i.e. perpendicular to the tangent drawn at any point on the path of motion.
In cases of uniformly accelerated motion how may the final velocity be expressed in terms of initial velocity and acceleration and elapsed time?
Vf = Vi + a t
Why is the velocity 0 when your speed is constant?
It's not. If you speed is constant (but not zero), then your velocity won't be zero, either.You may be confusing this with the following: If your VELOCITY (not your speed) is constant, then your ACCELERATION is zero. Acceleration refers to how quickly velocity changes, so if velocity doesn't change at all, acceleration is zero.
Why is linear motion not an accelerated motion?
"Linear" just means in a straight line. It may or may not be accelerated.Accelerated means that the velocity changes.
How is velocity of zero different from an acceleration of zero?
Velocity basically means how fast you are going. Acceleration means how much your speed is increasing. So if there is zero velocity that means the object is not moving. If there is zero acceleration, that means that the speed is not increasing but there is actual speed and the object is not increasing it's speed what ever that may be.
