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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.


Solution

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

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

$$(c)$$ 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.

Physics

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