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AP Physics C: Mechanics
3.5 Power
3.1 Translational Kinetic Energy
IntermediateMCQMathematical16k
A winch pulls a sled of mass m up an incline with force F at speed v.
A winch pulls a sled of mass m up an incline with force F at speed v.
A motorized winch pulls a 2.0 kg sled up an incline. The cable exerts a tension force of magnitude F directed parallel to the incline. Sensors record the cable tension and the sled speed along the incline at five discrete times: at t = 0.0 s, F = 40 N and v = 0.0 m/s; at t = 1.0 s, F = 45 N and v = 3.0 m/s; at t = 2.0 s, F = 55 N and v = 6.0 m/s; at t = 3.0 s, F = 70 N and v = 9.0 m/s; and at t = 4.0 s, F = 90 N and v = 12.0 m/s. The sled speed increases linearly with time throughout this interval. Which of the following correctly identifies the instantaneous power delivered by the cable, the instantaneous rate of change of the sled's kinetic energy, and the sled's kinetic energy at t = 3.0 s?

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