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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A body of mass 4 kg moving with velocity 12 m/s collides with another body of mass 6 kg at rest. If the two bodies stick together after collision, then the loss of kinetic energy of the system is

Answer: (C)

Solution

Loss in KE for a perfectly inelastic collision = [m₁m₂/(2(m₁+m₂))](u₁−u₂)² = [(4×6)/(2×10)](12−0)² = (24/20)(144) = 172.8 J.

Question ID VK-154097