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Questions  

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 ?

a
2s
b
2 s
c
3s
d
3 s

detailed solution

Correct option is B

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

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