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Q.

A body dropped from the top of a tower hits the ground after 4 s. How much time does it take to cover the first half of the distance from the top of the tower?

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a

1 s

b

2 s

c

22 s

d

3 s

answer is C.

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Detailed Solution

Let h be the height of the tower. Then h=12gt2=12g(4)2=8g.The time taken to fall through h2=4g is given by h2=12gt2 or 4g=12gt2 or t2=8 or t=22 s.
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