Q.

A body falls from 80 m. Its time of descent is [g = 10 ms-2]

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a

3s

b

4 s

c

5 s

d

6 s

answer is B.

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Detailed Solution

h = 0xt +1/2 gt2⇒ t =√(2h/g)= √(2x80/10)  sec = 4 sec
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