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A mass of 12 Kg at rest explodes into tw...

A mass of 12 Kg at rest explodes into two pieces of masses 4 Kg and 8 Kg which move in opposite directions. If the velocity of 8 Kg peice is 6 `ms^(-1)`, then the kinetic energy of the other piece in joules is

A

64

B

128

C

144

D

288

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The correct Answer is:
D
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