If you lift a 40 lb. rock 5 ft. from the ground, how much work have you done?

200 ft. lb.

Explanation

Work is force times distance. In this case, the force is the weight of the rock so:
\(W=f \times d=40 \mathrm{lb.} \times 5 \mathrm{ft.}=200 \mathrm{ft.} \mathrm{lb.}\)

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