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A ball is thrown at an angle θ with the horizontal. Its initial kinetic energy is 100 J and it becomes 30 J at the highest point.

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A ball is thrown at an angle θ with the horizontal. Its initial kinetic energy is 100 J and it becomes 30 J at the highest point. The angle of projection is 

(a) 45° 

(b) 30° 

(c) cos–1 (3/10)

(d) cos-1 (√3/10)

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Correct Option (d) cos-1 (√3/10)

Explanation:

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