A2kg toy car with avelocity of 5m/s collides elastically with with asecond toy car that has avelocity of -2m/s. after the collision,the 2kg toy car has a velocity of 3m/s and the second car has avelocity of 2m/s.using the conservation of momentum, what is the mass of the second car?
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answer. 12kg
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