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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

Two bodies A and B have masses 20 kg and 5 kg respectively. Each one is acted upon by a force of 4 kgwt. If they acquire the same kinetic energy in times tA and tB, then the ratio tA/tB is

Answer: (B)

Solution

Equal kinetic energy: ½mAvA² = ½mBvB² ⟹ vA/vB = √(mB/mA) = √(5/20) = 1/2. Since the same force F acts on both, the

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Question ID VK-153922