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A metal ball of mass 2 kg moving with a ...

A metal ball of mass 2 kg moving with a velocity of `36km//h` has a head on collision with a stationery ball of mass 3 kg. If after the collision, the two balls move together, the loss in kinetic energy dur to collision is

A

100 J

B

140 J

C

40 J

D

60 J

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