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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

8s

c

3s

d

6s

answer is C.

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Detailed Solution

Time interval =2vg⇒2=2×v10⇒v=10

v2 = u2 + 2as 

⇒ 102 = u2 - 2 × 10 × 40

 ⇒ u2 = 900 

⇒ u = 30
T=2ug=2×3010=6

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