Physics

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No. Velocity is the change in position over time. So if the velocity is negative, then the change in position must be negative - unless time is moving backwards.

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0when velocity is increasing,accleration is positiveand when velocity is decreasing,accleration is said to be negative.

Positive Acceleration refers to the force acting on an object whose speed increases as it moves away from its original starting position. If the velocity is increasing along with time it is called positive acceleration, and if the velocity decreases it is negative acceleration.

Deceleration. Negative acceleration = Velocity is decreasing by time. Positive acceleration = Velocity is increasing by time. Zero acceleration = Velocity is the same by time.

No, momentum can not have a negative velocity. Velocity is the rate of motion of a body from one position to another position in a particular direction. Bodies traveling in opposite directions may appear to have a negative velocity in relationship to each other but any amount of velocity is positive.

Certainly. For example, a pendulum at its left-most position.

Yes, decreasing acceleration could still be positive, which yields an increase in velocity (speed). Velocity is the rate of change of position, and acceleration is the rate of change of velocity. As long as the acceleration is positive, then velocity is increasing. If acceleration becomes negative, then velocity is decreasing. ======================= I second that accelerated motion ! Even if the acceleration is petering out, as long as it's still more than zero, the speed can be increasing. By the way ... you can have a big solid acceleration, and it doesn't mean that the speed or the size of the velocity has to be increasing. Or even changing. But that's another story.

In this case, acceleration is positive. Negative acceleration would cause the object to slow down (decelerate.)

Velocity can either increase or decrease. It can do so at either an increasing or decreasing rate (positive or negative acceleration)

Positive acceleration means the magnitude of velocity is increasing,i.e. something is speeding up.Negative acceleration means the magnitude of velocity is decreasing,i.e. something is slowing down.

The rate of change of velocity is called acceleration or deceleration depending on whether change is negative or positive ie; velocity is increasing or decreasing.

when the acceleration of the body is positive its mean that its velocity is increasing and the speed of the motion also increases and speed will decrease when acceleration is negative.

no a body can only have positive velocity .sometimes it have negative acceleration

Well let's see. If you define sea-level as zero elevation, and the upward direction as positive, then a submarine that's in the process of rising to the surface has a negative position and positive velocity. If I spent a while at it, I guess I could think of about 17 other examples, and I'll bet you could too.

Yes. An object slowing down but still moving in a positive direction has a positive velocity but a negative acceleration.

Acceleration is change in velocity. It is a vector, so some direction is choosen as positive and the opposite direction as negative. Then you have two possibilities;(1) the object is increasing its speed in the negative direction. (2) the object is decreasing its speed in the positive direction. Both of these give negative acceleration. For example; if up is choosen as positive then acceleration due to gravity is always negative because when a projectile is projected up with some initial velocity it decreases its speed on the way up. But on the way down its increasing its speed, in the negative direction.

Concave up. "Acceleration is increasing with time" tells us that the derivative of acceleration is positive. Since acceleration is the derivative of velocity, this means that the second derivative of velocity is positive. By definition, having a non-negative second derivative means that velocity is concave up.

For positive velocity: p=vt(Position=velocity*time) The velocity will be positive.For negative velocity: p=p(0)+vt(Note: The "0" represents the position at time "0" which is also known as the y-intercept, which is the point where the line crosses the vertical axis. A different label, such as x could be used to represent the position.) The velocity will be negative in this formula.Example: Write the position equation for a person who starts 3 meters behind the reference point and walks with a constant velocity v=6 m/s in the positive direction.Answer: p=-3+6t

Positive and negative velocities are simply velocities in opposite directions.Before you start working on the situation, you definewhich direction you'regoing to call positive. Anything you find moving the other way has negativevelocity.

no because acceleration can be negative due to decreasing of velocity so its not possible

I'm not quite sure what you're asking, but.....An object that is accelerating simply means that that object's velocity is changing. It can be increasing (positive accel.) or decreasing (negative accel.). If the acceleration is zero, that means the velocity is constant.(Keep in mind that these are all vector quantities, so they will have directions as well as magnitudes, and the positive/negative may be reversed.)

Positive velocity: p=vt (position = velocity*time) Example: Write the position equation for a person who starts 3 meters behind the reference point and walks with a constant velocity v=6 m/s in the positive direction. Answer: p=-3+6t Example: What is the position of the person 5 seconds after the start of motion? Answer: p=-3+(6x5)=27 m. Negative velocity: p=p(0)+vt p(0) represents the position at time "0" which is also known as the y-intercept or the point where the line crosses the vertical axis. The velocity of the object in motion would be negative.

I don't think velocity can be a negative number... Use positive.

If acceleration is positive then velocity goes on increasing by equal amount in equal intervals of time, however small the interval may be If the same acceleration is negative then velocity goes on decreasing as described above

If the constant acceleration is positive, the graph would be an exponential (x2) graph. If there is constant acceleration, then velocity is always increasing, making the position change at an ever increasing rate.

The 'speed' of a body cannot be negative. But if you are stating the 'velocity' then it can be negative. Negative velocity means it is going opposite to the direction that you decided to call the positive direction.

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