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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

A rectangular plank of mass m₁ and height a is kept on a horizontal surface. Another rectangular plank of mass m₂ and height b is placed over the first plank. The gravitational potential energy of the system is

Answer: (C)

Solution

The first plank's centre of mass is at height a/2: PE₁ = m₁g(a/2). The second plank's centre of mass is at height

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Question ID VK-153744