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From the top of a building 19.6 m high, ...

From the top of a building 19.6 m high, a ball is projected horizontal. After how long does it strike the ground ? If the line joining the point of projection to the point where it hits the ground makes an angle of `45^(@)` with the horizontal, what is the initial velocity of the ball ?

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SL ARORA-Motion in a Plane-Excercise
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