Posted by **Student** on Tuesday, January 22, 2013 at 10:26pm.

A 69990 kg locomotive is traveling at 9.86 m/s when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop? (The coefficient of rolling friction is 0.002.)

- Physics -
**Devron**, Wednesday, January 23, 2013 at 2:17am
Not sure, but I'll take a crack at it since no one else answered the question. KE=Force of Friction * distance. 1/2(MV^2)=mg *U*d= 1/2[(69,990Kg)(9.86m/s)^2 =(69,990Kg) (9.8m/s^2) *(0.002) *d. Masses cancel out, so the equation should be written as 1/2(9.86m/s)^2=(9.8m/s^2)*(0.002)*d. Rearranging the equation, solve for d.

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