Give examples where a. the velocity of a particle is zero but its acceleration is not zero. b.the velocity is opposite in direction to the acceleration, c. the velocity is perpendicular to the acceleration.

Explanation

(i) A particle thrown upwards has its velocity in opposite direction to its acceleration (g, dowanwards).
(ii) When the particle is released from rest from a certain height, its velocity is zero, while acceleration is g acting pendulum velocity is zero, while acceleration is not zero.
(iii) In uniform circular motion velocity is perpendicular to its radial or centripetal acceleration.