Q.

A ball is thrown vertically upward with a velocity u from the top of a tower . It strikes the ground with velocity 3u . The time taken by the ball to reach the ground is

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a

ug

b

2ug

c

3ug

d

4ug

answer is D.

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Detailed Solution

v=u+at⇒3u=−u+gt⇒t=4ug
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