A single rail car with a mass of M rolls down the track with a speed of 7 m/s. It hits and couples to two rail cars (already connected together) which have a combined mass of 2M. What is the speed of the three-car combination after the collision?A single rail car with a mass of M rolls down the track with a speed of 7 m/s. It hits and couples to two...?
1/3V
Simple Conservation of Momentum problem (p=mv)
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