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A body falls from a height of 120 m. After 2 s of fall, if gravity disappears then total time taken to reach the ground is (g = 10 m/s Square)

(a) 9 s (b) 5 s (c) 7 s (d) 10 s

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(a) 9 s (b) 5 s (c) 7 s (d) 10 s

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H = 120 meters

v = u + g t

= 0 + 10 m/s/s * 2 sec = 20 m/s

distance traveled in 2 sec

s = u t + 1/2 g t^2 = 0 + 1/2 * 10 * 2^2 = 20 meters

Distance to travel = 120 - 20 = 100 m

velocity = 20 m/sec is constant as there is no gravity.

time taken = 100 m/ 20 m/s = 5 seconds

v = u + g t

= 0 + 10 m/s/s * 2 sec = 20 m/s

distance traveled in 2 sec

s = u t + 1/2 g t^2 = 0 + 1/2 * 10 * 2^2 = 20 meters

Distance to travel = 120 - 20 = 100 m

velocity = 20 m/sec is constant as there is no gravity.

time taken = 100 m/ 20 m/s = 5 seconds