Posted by alexus on Thursday, October 4, 2012 at 5:24pm.
43 - ckf * 140 = m*a
where ckf is coefficient of kinetic friction. In your textbook ckf is probably represented as the greek letter mu, but it's really hard to write greek letters here. . .
m is the mass of the sled, and a is its acceleration. Since the sled is moving at a constant speed, the acceleration is 0, or
43 - ckf * 140 = 0
Solve for ckf
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