Physics, 08.08.2019 01:30, dearydn22

A9.13e+3 kg railroad car is rolling at 3.15 m/s when a 4.20e+3 kg load of gravel is suddenly dropped in from directly above. what is the car's speed immediately after the gravel is dropped in?

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A9.13e+3 kg railroad car is rolling at 3.15 m/s when a 4.20e+3 kg load of gravel is suddenly dropped...