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A metal ball of mass 2 kg moving with a velocity of 36 km/h has a head on collision with a stationary ball of

A metal ball of mass 2 kg moving with a velocity of 36 km/h has a head on collision with a stationary ball of mass 3 kg. If after the collision, the two balls move together, the loss in kinetic energy due to collision is (a) 140 J (c) 60 J (b) 100 J (d) 40 J

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