ANSWERS - AP Physics Multiple Choice Practice – Torque

In this example, as the radius decreases the velocity increases to conserve momentum. To find the breaking force, use impulse-momentum. J = ∆p Ft = mvf – mvi. F (5) = 0 – (900)(20) F = – 3600 N. The average velocity of the car while stopping is found with = 10 m/s Then find the power of that force P = F = (3600)(10) = 36000 W D ... ................
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