A body of mass 10 kg moving with velocity of 10m/s hits another body of mass 30 kg moving with velocity 3 m/s in same direction. The co-efficient of restitution is 14. The velocity of centre of mass after collision will be
A
20m/s
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B
40m/s
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C
194m/s
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D
234m/s
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Solution
The correct option is C194m/s Before collision, vcm=(10)(10)+(30)(3)10+30=194m/s Since no external force acts on system, velocity of centre of mass remains constant. The correct option is (C)