Question

Please look at picture.

Here are my equations:
For 10kg:
-uk m2 g cosθ -T -m2 g sinθ=m2 a

For 20kg:
T-m1 g =m1 a

Add them:

-uk m2 g cosθ -m2 g sinθ -m1 g =(m2+m1) a

a= 5 m/s^2 (kinematics equations)

Isolating uk gives 3.66!

The real answer is 0.16.

Answer 1

@whpalmer4 @robtobey

Answer 2

@timo86m

Answer 3

@iPwnBunnies

Answer 4

There is a mistake here:

For 10kg:
-µk m2 g cosθ -T \(\color{red}+\) m2 g sinθ=m2 a

Answer 5

I find µ = 0.125