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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

A steel ball of mass 5 g is thrown downward with velocity 10 ms⁻¹ from height 19.5 m. It penetrates sand by 50 cm. The change in mechanical energy will be (g = 10 ms⁻²)

Answer: (B)

Solution

Taking the final resting point (in the sand) as the reference, the mechanical energy lost (converted to work against the sand's resistance)

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Question ID VK-153571