A ball of mass 100 g is projected with velocity 20 m / s at 6 0 ∘ with horizontal. The decrease in kinetic energy of the ball during the motion from point of projection to highest point is

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​ k i ​ = 2 1 ​ mv 2 k f ​ = 2 1 ​ m ( v cos 6 0 ∘ ) 2 = 8 1 ​ m v 2 Δ k = k i ​ − k f ​ = 8 3 ​ mv 2 = 8 3 ​ × 0.1 × 400 = 15 J ​

Physics - Kinematics 2D Question with Solution | TestHub

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