Question

An example of zero velocity but non zero acceleration

Answer 1

Yes, a typical object can have zero velocity but non zero acceleration at the same moment.
For example, when an object is thrown straightly upwards, at the maximum height, it has zero velocity, but still an acceleration of 9.8 m/s2 [gravitational acceleration] is applied on it, that's why we can say that the projectile has zero velocity but non zero acceleration on the maximuh height.

Hope it helped. ^^

Answer 2

when a body is at rest on the surface of Roof above the surface of Earth. here acceleration is 9.8 but the body has zero velocity.