Ignore B & C for now
The block in the figure reaches a velocity of 40 m/sec in 100 m, starting from rest. Compute the coefficient of kinetic friction between the block and the ground.
W = 100N
F = 40 N
2. Homework Equations
∑Fy = 0 so Normal Force = Weight
∑Fx = Force - Inertia - Frictional Force - Weight = 0
The Attempt at a Solution
0.5 (V^2 -Vo^2) = as
0.5 (40^2 - 0) = a(100m)
a = 8 m/s^2
So I got this equation:
40 N = 100 N ( cos90) + 100N (8m/s^2 / 9.806 ) + 100 N ( μ)
I ended up getting a negative coefficient of friction which is
-0.415827. Is there something wrong with my equation?