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From the topof building 78.4 high , ba...

From the topof building 78.4 high , ballis throw horizontally which hits the ground at a distance the line joining the building top to the point where the balls hits the ground makes an angle of `45^(@)` with ground line. Find the initial velocity of ball ?

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The correct Answer is:
`19.6ms^(-1)`
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A ball is projected horizontally from the top of a building 19.6 m high. If the line joining the point of projection to the point where it hits the ground makes an angle of 45° to the horizontal, the initial velocity of the ball is

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