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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 kg-wt. If they acquire the same kinetic energy in times and , then the ratio / is

Answer: (B)

Solution

= F/ = 2 ms⁻², = F/ = 8 ms⁻². Starting from rest, K = ½m(at)², so equal KE at times ,

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Question ID VK-153595