Posted by **Daniel** on Wednesday, November 3, 2010 at 5:22pm.

A 75 kg box slides down a 25 degree ramp with an acceleration of 3.60 meters per second squared. Find the coefficient of kenetic friction between the box and the ramp. What acceleration would a 175 kg box have on this ramp?

- Physics -
**Daniel**, Wednesday, November 3, 2010 at 5:23pm
I have the first part of the question (0.061). I need the second part.

- Physics -
**bobpursley**, Wednesday, November 3, 2010 at 5:29pm
forcenetdown= mass*a

mgSinTheta-mu*mg*cosTheta=mass*a

but notice mass divides out, so acceleration is independent of mass, if it is moving.

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