Kinematics Question 517

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

Options:

A) sin1(18)

B) 12sin1(18)

C) 13sin1(18)

D) 14sin1(18)

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Answer:

Correct Answer: B

Solution:

[b] u2sin2θg=(u/2)2sin30g=u28g

sin2θ=12 or θ=12sin1(18)



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