Under what conditions acceleration is zero for a moving body?

(1): When magnitude and direction of the velocity do not change, the acceleration of moving body is zero. (2): To satisfy condition (1) the resultant force on the body has to be zero. read more

(1): When magnitude and direction of the velocity do not change, the acceleration of moving body is zero. (2): To satisfy condition (1) the resultant force on the body has to be zero. This page may be out of date. read more

Constant zero acceleration is a particular case of constant acceleration, so at constant zero acceleration the instantaneous accelerations is the same than the average acceleration: zero. But, it is not true that only at zero acceleration the instantaneous acceleration is equal than the average acceleration. read more