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The steps in collision

Question

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

Moderate
Solution

\large 6v = \left( {6 + x} \right)\frac{v}{3}\ \Rightarrow18=6+x\Rightarrow x=12\;kg



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