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Question

A body of mass 6 kg collides with another body at rest. After the collision, they travel together with a velocity that is one third of the initial velocity of 6 kg mass. The mass of the second body is


A

60 kg

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B

30 kg

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C

12 kg

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D

18 kg

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Solution

The correct option is C

12 kg


m1=6kg u1=?, u2=0; v1=v2=u13, m2=?L.O.C.M:m1u1+m2u2=(m1+m2)vm2=12kg


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