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10.33.
Model:
Model your vehicle as a particle. Assume zero rolling friction, so that the sum of your kinetic
and gravitational potential energy does not change as the vehicle coasts down the hill.
Visualize:
The figure shows a beforeandafter pictorial representation. Note that neither the shape of the hill nor the angle
of the downward slope is given, since these are not needed to solve the problem. All we need is the change in
potential energy as you and your vehicle descend to the bottom of the hill. Also note that
35 km/ hr
(35,000 m/3600 s)
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 Fall '09
 geller
 Energy, Friction, Potential Energy

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