Q.

A particle is projected vertically upward with velocity u from a point A, when it returns to the point of projection

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a

Its average speed is u/2.

b

Its average velocity is zero.

c

Its displacement is zero.

d

Its average speed is u.

answer is A.

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Detailed Solution

For vertically projected body, if it returns to the starting point, displacement and average velocity become zero. As acceleration is constant, average speed during upward or downward motion is (u+0)/2=u/2. The same will be the average speed for the whole motion.
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