Physics question about speed & collision


Question description

Dancer, who has a mass of 7 kg, ran at 3 m/s directly at Prancer who has a mass of 10 kg. If both reindeer come to a stop after the collision, what was Prancer's velocity before the collision?
In general, how do I solve this type of questions? Please explain and give me at least 5 more related sample quesitons with explanations.

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(Top Tutor) James M847
School: UCLA
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