Carts a and B Have Equal Masses and Travel Equal

Multiple Choice

Carts A and B have equal masses and travel equal distances on straight frictionless tracks while a constant force F is applied to A, and a constant force 2F is applied to B. The relative amounts of work done by the two forces are related by:

A) WA = 4 WB.
B) WA = 2 WB.
C) WA = WB.
D) WB = 2 WA.
E) WB = 4 WA.