Rocket Science on Barges
How much additional force must be provided by the driving engines of (a) the faster barge and (b) the slower barge if neither is to change 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. Choose the answer that equals the sum of answers to (a) and (b).
Problem credit: Fundamentals of Physics Extended, 9th Edition