The Attempt at a Solution
Here is my attempt. I assumed that both the man and the box would slide down the incline. (The box is the left diagram and the man is on the right)
The acceleration I get from this attempt tells me that they accelerate the other way. So do I have to change the directions of the friction forces to find the answer? I am not sure what to do next. Also how do I use the coefficient of static friction in this question?
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