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Inelastic collision

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Inelastic collision diagram
If one body (A) with a velocity (a) strikes a second body (B) and sticks to it, then the resulting larger body will have a slower velocity (b), calculable by the law of conservation of momentum.
Mass A
Velocity a
Mass B
Velocity b

Mass B
Velocity b
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In any closed system, momentum is conserved. Thus, it is possible to equate momentum in the start and final states of a system and thus calculate an unknown.
Fill in the "start" conditions: Mass and velocity of A. Then fill in either the mass of B or the final velocity of A+B. The calc will provide the unknown mass or velociy of B.
The calc also gives the momentum of the system.