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

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6 kg

3 kg

12 kg

18 kg

answer is C.

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Detailed Solution

m1u1+m2u2=m1v1+m2v2 6u+0=6+m2u3 m2=12kg

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