# physics very hard question

April 9, 2021
###### discussion post 844
April 9, 2021

Two long barges are moving in the same direction in still water, one
with v1 = 10km/h and the other with v2 = 20 km/h. While they are passing each
other, coal is shoveled from the slower to the faster one at a rate of 1000 kg/minute.
How much additional force must be provided by the driving engines of the faster barge
if it is to maintain a constant forward speed? Assume that the shoveling is always
perfectly sideways, and that the frictional forces between the barges and the water do
not depend on the mass of the barges.
The boats are same lengths widths etc. Their dimensions are same.
Can you please show work and how to do it?

Its a multiple choice question so possible answers are

A) 667N B) 0N C) 185N D) 92N E) 278 N

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