Question

Give example 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.

Answer 1

$\left(a\right)$ At the top most point when a particle is thrown vertically upward, $v=0$ and $a=-g.$

$\left(b\right)$ When a body is thrown up, then while going up, velocity is upward but the acceleration is vertically downward.

$\left(c\right)$ When a body is moving on a circular path with uniform speed, then its velocity is tangential and the acceleration is radial( centripetal acceleration). That is velocity is normal to acceleration.