I tried it and I got it right. :)
I did:
FF = M.FN
FN = mg = 85 (9.8)
FF = 0.110 (85 x 9.8) = 91.7235 N
W = (91.7235)(0)(21) = 1926.1935
W = -1.90 x 10^3 J
made it cos180 which made it negative.
Thanks.
Homework Statement
A toboggan carrying two children with a total mass of 85.0 kg reaches its maximum speed at the bottom of a hill, and then glides to a stop in 21.0 m along a horizontal surface. The coefficient of kinetic friction between the toboggan and the snow surface is 0.110. Calculate...