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A body of mass 5 kg strikes another bodf...

A body of mass 5 kg strikes another bodfy of mass 2.5 kg initially at rest.The bodies after collision coalesce and begin to move as a whole with a KE of 5 j.the KE of the first body before collision is:

A

7.5 J

B

5 J

C

2.5 J

D

10 J

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