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W = F*d W = -F*d W = 0 W = F*v W = - F*v

A car traveling to the right with a speed v brakes to a stop in a distance d. The work done on the car by the frictional force F is: (Assume that the frictional force is constant). W = F*d W = -F*d W = 0 W = F*v W = - F*v. v. d. F. Car. Truck.

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W = F*d W = -F*d W = 0 W = F*v W = - F*v

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  1. A car traveling to the right with a speed v brakes to a stop in a distance d. The work done on the car by the frictional force F is: (Assume that the frictional force is constant). • W = F*d • W = -F*d • W = 0 • W = F*v • W = - F*v v d F

  2. Car Truck A lighter car and a heavier truck, each traveling to the right with the same speed v, hit the brakes. The retarding frictional force F on both cars turns out to be the same constant. After both vehicles travel a distance d (and both are still moving), which of the following statements is true? • The work done on both vehicles is the same. • The average power expended is the same. • They will have the same velocity. • They will have the same kinetic energy • They will traverse the distance d in the same time. d F F d

  3. A lighter car and a heavier truck, each initially at rest, are pushed with the same constant force F. After both vehicles travel a distance d, which of the following statements is true? (Ignore friction) • The average power expended is the same. • They will have the same velocity. • They will have the same kinetic energy • There’s not enough information to answer. F d Car F d Truck

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