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AP Physics C: Mechanics
3.5 Power
3.2 Work
IntermediateMCQConceptual15.8k
A Cartesian coordinate graph showing power versus time. The horizontal axis is labeled \(t\text{ (s)}\) with numerical tick marks at 0, 2, 4, 6, 8, and 10. The vertical axis is labeled \(P\text{ (W)}\) with numerical tick marks at 0, 40, 80, and 120. Thin, dashed gray gridlines extend across the plot at each major tick mark. A single thick, solid black line represents the piecewise linear function: starting at the origin (0, 0), it extends upward to the point (4, 120), continues horizontally to the point (8, 120), and then slopes downward to end at (10, 0) on the horizontal axis. No other curves, labels, shading, or text appear.
Power \(P\) delivered by the winch as a function of time \(t\).
A motorized winch lifts a crate vertically from rest. The power \(P\) delivered by the winch as a function of time \(t\) increases linearly from \(0\text{ W}\) at \(t = 0\text{ s}\) to \(120\text{ W}\) at \(t = 4\text{ s}\), remains constant at \(120\text{ W}\) until \(t = 8\text{ s}\), and then decreases linearly to \(0\text{ W}\) at \(t = 10\text{ s}\), as shown in the graph. Which of the following statements correctly interprets the work done or power delivered during this process?

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