Block A (2kg) sits on top of Block B (5kg), which sits on the floor. The coeffic

Question

Block A (2kg) sits on top of Block B (5kg), which sits on the floor. The coefficient of static friction between A and B is Mu; the coefficient of kinetic friction between B and the floor is 0.4. Block B is pulled to the right by a constant horizontal force F, causing the two blocks to accelerate together to the right at 8m/s^2. Assume that Block A remains at rest on top of Block B as the two accelerate. Draw a diagram before applying Newton's laws.

What is the direction of the static friction force acting on A?
What is the value of Mu? [0.816]
What is the value of F? [83.44N]

The correct answers are in the brackets. I just need help arriving at that point.

Explanation / Answer

Both static and kinetic friction are in the opposite direction of the applied force

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