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A body of mass m moving with velocity v collides head on with another body of mass 2m which is initially at rest. The ratio of K.E. of colliding body before and after collision will be

(a)  1 : 1                                    (b)  2 : 1

(c)   4 : 1                                    (d)  9 : 1

Answer: d

(6)

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