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Q. Two 5000 kg passenger cars roll without friction (one at 1 m/s, the other at 2 m/s) toward one another on a level track. They collide, couple, and roll away together with the combined momentum.

Q. A rope applies a horizontal force of 180N to pull a crate a distance of 2m across the floor. A frictional force of 60N opposes this motion.
A. What is the work completed by the force applied by the rope?
B. What is the work completed by the frictional force?
C. What is the total work completed on the crate?

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