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Q.

A body is projected vertically up with a velocity v and after some time it returns to the point from which it was projected. The average velocity and average speed of thebody for the total time of flight are

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a

v→/2 and v/2

b

0 and v/2

c

0 and 0

d

v→/2 and 0

answer is B.

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Detailed Solution

Average velocity = 0 because net displacement of the body is zero. Average speed = Total distance covered Time of flight =2Hmax2u/g⇒ vav=2u2/2g2u/g⇒vav=u/2Velocity of projection = v (given)∴ vav=v/2

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