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Q- A railroad hopper car weighs 50000 kg when empty and contains 50000 kg of coal. As it coasts along the track at 9 m/s the hopper opens and steadily releases all the coal onto a platform below the rails over a period of 6 s.

a) How fast does the car travel after all the coal is dumped?

b) What was the momentum absorbed by the platform?

c) If the coal comes to rest 1 second after the dumping is finished, what was the average horizontal force on the platform?

d) If the coal fell 2 m, what was the total energy converted to heat in the process of the coal coming to rest?


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