Test Academy | 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 45°, 30°, cos⁻¹(3/10), cos⁻¹(√(3/10))

Question

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

Options :

45°
30°
cos⁻¹(3/10)
cos⁻¹(√(3/10))

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