Question

In two dimensional motion, instantaneous speed $v_0$ is a positive constant. Then , which of the following are necessarily true?
(a) The average velocity is not zero at any time
(b) Average acceleration must always vanish.

Answer 1

Since instantaneous speed $v_0$ is a positive constant the acceleration has to vanish but average velocity can be zero if the particle comes back to its original position.

(b) is true.

(a) may not always be.