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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

A rock of mass m is dropped to the ground from a height h. A second rock, with mass 2m, is dropped from the same height. When the second rock strikes the ground, what is its kinetic energy? [UP SEE 2009]

Answer: (A)

Solution

Both rocks fall through the same height h, so they strike the ground with the same speed v = √(2gh),

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Question ID VK-153597