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A 31,000 kg freight car is coasting at 0.900 m/s with negligible friction under a hopper that dumps 120,000 kg of scrap metal into it.

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A 31,000 kg freight car is coasting at 0.900 m/s with negligible friction under a hopper that dumps 120,000 kg of scrap metal into it. (a) What is the final velocity (in m/s) of the loaded freight car? (Enter the magnitude.) m/s (b) How much kinetic energy (in J) is lost

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