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A point mass 1 kg collides elastically w...

A point mass 1 kg collides elastically with a stationary point mass of 5 kg. After their collision, the 1 kg mass reverses its direction and moves with a speed of 2 m/s. For the system of these two masses the KE of the centre of mass is

A

A. 1 J

B

B. 1.5 J

C

C. 0.75 J

D

D. 0.5 J

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