Physics question about speed & collision

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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?

Mar 24th, 2015

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. 

Mar 24th, 2015

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Mar 24th, 2015
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Mar 24th, 2015
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