A force of 50 pounds acts in a direction 60° above horizontal, moving an object 100 feet from (0, 0) to (100, 0). How much work is done by the force?

Work is force times displacement in the direction of the force: W = Fd cos θ. The displacement is 100 feet horizontally, while the 50-pound force is at 60° to that direction, so W = 50 × 100 × cos 60° = 5,000 × 0.5 = 2,500 foot-pounds. The correct choice is 2,500 foot-pounds.

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