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Q.

A boy playing on the roof of a 10 m high building throws a ball with a speed of 10 ms-1 at an angle of 300 with the horizontal. How far from the throwing point will the ball be at a height of 10 m from the ground?

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a

5.2 m

b

4.33 m

c

2.66 m

d

8.66 m

answer is D.

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Detailed Solution

R=u2sin2θg=102×sin 60010m =8.66 m .
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