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Q.

A ball is projected horizontally from the top of a building 58.8 m high. If the line joining the point of projection to the point where it hits the ground makes an angle of 60o to the horizontal, the initial velocity of the ball is

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a

29.4ms1

b

9.8ms1

c

19.6ms1

d

14.7ms1

answer is B.

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Detailed Solution

Tan60°=hR=hu.2hg

  u=gh6=9.8ms1

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