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Q.

A boy playing on the roof of a 10 m high building throws a ball with a speed of 10ms–1 at an angle of 30o with the horizontal. How far from the throwing point will the ball be at height of 10 m from the ground?

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a

5.2 m

b

2.66 m

c

4.33 m

d

8.66 m

answer is D.

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Detailed Solution

Required range of the projectile with
U=10ms,θ=30∘

R=U2sin⁡2θg=8.66m

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