Q. Assertion : A particle may be momentarily at rest and yet have non-zero acceleration.
Reason : The zero velocity of a particle at any instant does not necessarily imply zero acceleration at that instant.

 2626  174 Motion in a Straight Line Report Error

Solution:

A particle may be momentarily at rest and yet have non-zero acceleration. For example, a particle thrown up has zero velocity at its uppermost point but the acceleration at that instant continues to be the acceleration due to gravity.