From the top of a tower 20 m high, a ball is thrown horizontally. If the line joining the point of projection to the point where it hits the ground makes an angle of 45o with the horizontal, then the initial velocity of the ball is:

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10 ms-1

4 ms-1

15 ms-1

3 ms-1

answer is A.

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Detailed Solution

Since angle with the horizontal is 45o, vertical height = range⇒ 20 = u ×2 or u = 10 ms-1(∴ t = 2hg= 2×2010= 2s)

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