Physics

# When is velocity zero?

When an object is not moving. (Velocity is speed)

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## Related Questions

Yes. Zero velocity is a velocity; if it is always zero then it is a constant velocity.

If an object has zero acceleration, its velocity doesn't have to be zero. Acceleration is a measure of the change in velocity over time. Zero acceleration means there is no change in velocity over time, namely constant velocity. Constant velocity can be any velocity (including zero velocity or "at rest"), so the object's velocity doesn't have to be zero to have zero acceleration.

No. Acceleration is the change of velocity. If velocity is constant, at any speed, acceleration is zero.

Average velocity is zero if the displacement is zero. Average velocity = Displacement/Time = 0/Time = 0.

Acceleration is changing velocity. Zero velocity means no motion. Zero acceleration means constant, unchanging motion.

velocity may be zero or may not be zero i.e. if the object may continue to move with uniform velocity.

Yes, an object can have a velocity of zero and an acceleration of zero. It's an object with a velocity of zero and no net applied force.

Whenever velocity is constant, the acceleration is zero. This also works when the velocity is zero, the acceleration is zero. That pretty much means the object isn't moving. But, yes/ If velocity is constant, accleration is zero.

I'm not a scientist, but the following seems reasonable to me. If your frame of reference is the earth's surface, then it seems clear that an object can have zero velocity and zero acceleration. You could even have non-zero velocity and zero acceleration. What seems impossible is to have zero velocity and non-zero acceleration. When you think of accelaration think of changing velocity. A car moving straight down the highway at a constant speed of 55 mph is neither speeding up nor slowing down. Though it has velocity, there is no change in its velocity so acceleration will be zero. For a car parked on the side of the road, on the other hand, its velocity will be zero but what about its acceleration? Is velocity changing? No, so it will have zero velocity and zero acceleration.Yes.

The velocity is zero when t=v0/g. This comes from velocity of the ball is v=v0-gt, where v0 is the velocity which the ball is thrown with, the initial velocity. The balls v velocity is the initial velocity v0 - the gravity velocity gt. when the real velocity is zero v= v0-gt=0. solving this for t gives when the velocity is zero.

Zero relative velocity to another object, sure no problem. Zero absolute velocity, not possible as there is no absolute reference to compare to.

Acceleration refers to the change of velocity per time unit. If the velocity doesn't change, acceleration is zero.

Yes, you can. Zero acceleration simply means there is no CHANGE in velocity. It doesn't mean there is no velocity.

The average acceleration from zero is the final velocity divided by the amount of time to reach that velocity.

"Uniform velocity" means zero acceleration, that is, constant speed in a straight line.rate of change of velocity is zero

If an object is at rest, it has no velocity - its velocity is zero. More precisely, since velocity is a vector, in this case the velocity would be the null vector.

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.

Uniform velocity means the velocity is not changing. Acceleration is defined as the rate of change of velocity. If velocity isn't changing, the rate of change is zero.

Yes...acceleration is the rate of change of velocity with time.....therefore when velocity is zero..definitely acceleration is zero This is not exactly true; at an instant in time the acceleration can be non-zero while the velocity is zero. However, this would change the velocity to non-zero after any amount of time. An example of this is when you throw a ball into the air: at it's highest point, the velocity is zero (it changes from going upward to going downward, passing through zero for an instant). However the acceleration is downward the entire time.

When an object is in equilibrium, the acceleration is zero. When the acceleration is zero, the velocity does not change; the non changing velocity includes the case when the velocity has value zero.

Only for an instant. Acceleration is a change in velocity. When the derivative of acceleration with respect to time is zero, the velocity would be zero.

Yes. A body having zero velocity has a constant acceleration of zero.

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