# Answer on Mechanics | Relativity Question for jade

Question #7759

if the velocity of an object is zero is the acceleration also zero?motivate your answer

Expert's answer

If an object has constant& velocity, that involves zero acceleration cause an acceleration is a dericative of velocity with respect to time.

But if an object has zero velocity at some instant, that doesn't mean that its acceleration is zero. To compute the acceleration you need at least two instances of velocity and remember velocity is both speed and direction. So an object can have constant speed at an instant but non zero acceleration (i.e. angular acceleration or changing direction). So, object has zero acceleration only if velocity is constant.

But if an object has zero velocity at some instant, that doesn't mean that its acceleration is zero. To compute the acceleration you need at least two instances of velocity and remember velocity is both speed and direction. So an object can have constant speed at an instant but non zero acceleration (i.e. angular acceleration or changing direction). So, object has zero acceleration only if velocity is constant.

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