Try using conservation of energy.
Work done against friction = PE loss - KE gain
W = M*g*(12 sin30) - (M/2)(10^2)
= 44 J
Average friction force = W/12 m = 3.67 N
A body of mass 5.0kg slides from rest down a plane inclined at 30degrees to the horizontal. After sliding 12m down the plane it is found to have a speed of 10m/s.
a) How much work has been done in overcoming friction along the plane?
b) Calculate the average value of the force of friction.
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