 #1
 106
 11
 Homework Statement:

See image1.
Block 1: 1M kg
Block 2: 2M kg
Block 3: 2M kg
Resulting acceleration: .5 m/s2
 Relevant Equations:

F = ma
fk = Fn * u
Image1, the exercise.
My solution:
Image2, my solution
The answer is .37 but I keep getting .45
What am I doing wrong?