A 87 kg freight car is coasting at a speed of 388 ms along
A 8.7 kg freight car is coasting at a speed of 38.8 m/s along a straight track when it strikes a 13.5 kg stationary freight car and couples to it. What will be their combined speed after impact?
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a 87 kg freight car is coasting at a speed of 388 ms along a straight track when it strikes a 135 kg stationary freight
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