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?
momentum conservation requires that m1v1+m2v2 =0
7*3 +10*V2 = 0
V2 = -2.1 m/s
- means it is in opposite direction of the velocity of dancer.
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