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Q.

A stone is projected vertically up from the ground with velocity 40 ms–1. The interval of time between the two instants at which the stone is at a height of 60 m above the ground is (g = 10 ms–2).

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a

4s

b

6s

c

8s

d

12s

answer is A.

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Detailed Solution

at h = 60 m velocity v2 = u2+2asv2=402 - 2 x 10 x 60 = 1600 -1200V2 = 400 ⇒ v = 20

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A stone is projected vertically up from the ground with velocity 40 ms–1. The interval of time between the two instants at which the stone is at a height of 60 m above the ground is (g = 10 ms–2).