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Q.

A stone thrown upward with a speed u from the top of the tower reaches the ground with a velocity 3u. The height of the tower is

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a

3u2/g

b

9u2/g

c

4u2/g

d

6u2/g

answer is B.

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Detailed Solution

v2=u2+2as

(3u)2=u2+2(g)(h)

8u2=2gh

h=4u2g

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