Question

Why the acceleration is zero when intialvelocity is zero

Answer 1

It is not necessary that acceleration will always be zero when initial velocity is zero.

For example when a car starts from rest (initial velocity=o) and after 5 sec it moves with velocity of 100km/h.There is acceleration.

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Answer 2

The acceleration of an object is not necessarily zero when its initial velocity is zero, and in fact, for an object to get to or acquire some velocity, some force is required. This force indicates that the body has undergone acceleration...

F = ma

=> F = mda = m(v - 0)/t