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February 1, 2015

February 1, 2015

Posted by **kiki** on Wednesday, November 30, 2011 at 9:14pm.

Can someone explain how to do it!

- physics -
**drwls**, Wednesday, November 30, 2011 at 11:17pmThey must expect you to neglect friction. The car would have to be in neutral gear, with well lubricated wheel bearings, and properly inflated tires.

The loss of potential energy, M g H, would then equal the gain in kinetic energy, (1/2)MV^2.

V = sqrt(2*g*H)

H = 12 m

g = 9.8 m/s^2

The car's mass does not matter when computing the velocity, but it does matter when computing kinetic energy. \

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