If you lift a 32 lb. rock 4 ft. from the ground, how much work have you done?

128 ft. lb.

Explanation

Work is force times distance. In this case, the force is the weight of the rock so:
\(W=f \times d=32 \mathrm{lb.} \times 4 \mathrm{ft.}=128 \mathrm{ft.} \mathrm{lb.}\)

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