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# 7a - Solution The height of the car initially is h = 6.0...

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PHY2053 – Section 6168 Quiz #7 Friday, February 27, 2004 Name_______________________________ UFID___________________ Please read the problem carefully and be sure to show all of your work. Partial credit will be given. An 1800 kg car starts from rest at the top of a 6.0 m long driveway that is sloped at 15° with the horizontal. If an average friction force of 1500 N impedes the motion, find the speed of the car at the bottom of the driveway.

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Unformatted text preview: Solution: The height of the car initially is: h = 6.0 sin 15° = 1.55 m The gravitational potential energy at the top is: PE = mgh = 27400 J At the bottom of the ramp, all of the energy is converted to kinetic energy and energy (heat) lost to due to friction. The energy lost due to friction is: W friction = Fd = 9000 J Thus, the kinetic energy remaining is: KE = PE - W friction = 18400 J The final velocity is: m KE v 2 = = 4.52 m/s...
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7a - Solution The height of the car initially is h = 6.0...

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