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December 21, 2014

December 21, 2014

Posted by **Becca** on Tuesday, December 5, 2006 at 5:28pm.

I know the equation I have to use is KE_i - PE_f = delta ME, but I don't know how to use the coefficient of friction in those equations.

All of the KE is lost due to friction. He had ke, now he has zero ke. Conclusion: all of the KE is dissipated in friction. The coefficent of friction is not needed for this part.

so the mechanical energy lost is just how much kinetic energy there was in the beginning?

I also need to find how far he slides, and the only equation that doesn't use time is vf^2=(vi)^2+2a*x, and I don't know acceleration either. What equation works?

Ok, you know the average force*distance=KE lost.

but force= mg*mu

solve for distance.

- Physics -
**Jill**, Sunday, January 13, 2013 at 2:15pma. -560 J

b. d = 1.2 m

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