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Q.

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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a

6 kg

b

3 kg

c

12 kg

d

18 kg

answer is C.

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Detailed Solution

6v=(6+x)v3⇒18=6+x⇒x=12kg
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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