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Question

A body is dropped from a height of 39.2 m. After it crosses half the distance, the acceleration due to gravity ceases to act. The body will hit the ground with velocity (Take g=9.8 m/s2 )

A

19.6 m/s

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B

28 m/s

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C

1.96 m/s

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D

196 m/s

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Solution

The correct option is A 19.6 m/s Suppose v be the velocity of the body after falling through half the distance. Then s = 39.22 = 19.6 m , u = 0 and g = 9.8 m/ s2 v2 = u2 + 2gs = 02 + 2 × 9.8 × 19.6 V = 19.6 m/s Then, it continues to move with same velocity till it hits the ground.

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