A ball is projected horizontally with a velocity of 5 m/s from the top of a building 19.6 m high. How long will the ball take to hit the ground ?

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2 s

3 s

answer is B.

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Detailed Solution

Let t s be time taken by the ball to hit the ground. ∵H=12gt2∴t=2Hg=2×19.6m9.8ms−2=2s.

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