The kinetic energy of a projectile at the highest point of it projection is 75% of its kinetic energy at the point of projection. Find the angle of projection.
A
45∘
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B
60∘
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C
30∘
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D
53∘
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Solution
The correct option is C30∘ Velocity at the highest point of an oblique projectile =ucosθ According to question KEtop=75100×KEinitial ⇒12mu2cos2θ=34×12mu2 ⇒cosθ=√32 θ=30∘