Kinematics Question 622

Question: A particle is projected at an angle of elevation α and after t seconds it appears to have an angle of elevation β as seen from point of projection. The initial velocity will be

Options:

A) gt2sin(αβ)

B)gtcosβ2sin(αβ)

C) sin(αβ)2gt

D)2sin(αβ)gtcosβ

Show Answer

Answer:

Correct Answer: B

Solution:

[b] t=2usin(αβ)gcosβ.;u=gtcosβ2sin(αβ)



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