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Two long barges are moving in the same direction in still water, one with a speed...

Two long barges are moving in the same direction in still water, one with a speed of 11 km/h and the other with a speed of 21 km/h. While they are passing each other coal is shoveled from the slower moving barge to the faster one at the rate of 1028 kg/min.

(a) How much additional force must be provided to the faster barge if it is to maintain a constant speed?


(b) How much must be provided to the slower one?

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