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Question

Two balls A and B are thrown with speed u and u/2 respectively. Both the balls cover the same horizontal distance before returning to the horizontal plane of projection. If the angle of projection of ball of B is 15 with the horizontal, then the angle of projection of A is

A
sin1(18)
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B
12sin1(18)
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C
13sin1(18)
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D
14sin1(18)
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Solution

The correct option is B 12sin1(18)
Range of ball A= Range of ball B
u2sin(2θ)g=(u/2)2sin(2×15)g
sin(2θ)=18
θ=12sin1(18)

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