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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A ball moving with speed v hits another identical ball at rest. The two balls stick together after the collision. If the specific heat of the material of the balls is S, the temperature rise resulting from the collision is

Answer: (A)

Solution

By momentum conservation, mv = 2mV ⟹ V = v/2. Loss in KE = ½mv² − ½(2m)(v/2)² = ½mv² − ¼mv² = ¼mv².

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Question ID VK-154199