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Q.

A bullet fired vertically up from the ground reaches a height 40 m in its path from the ground and it takes further time 2 seconds to reach the same point during descent. The total time of flight is (g = 10 ms-2)

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a

4s

b

3s

c

6s

d

8s

answer is C.

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Detailed Solution

Time interval = 2vg⇒2=2×v10⇒v=10v2=u2+2as ⇒ 102 = u2 - 2 x 10 x 40u2 = 100 +800 ⇒ u2 = 900 ⇒ u = 30T=2ug=2×3010=6

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A bullet fired vertically up from the ground reaches a height 40 m in its path from the ground and it takes further time 2 seconds to reach the same point during descent. The total time of flight is (g = 10 ms-2)