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## Homework Statement

Two boxes each weighing 900 N are stacked on a horizontal floor. Box A is on the bottom, box B is on the top. The coefficient of static friction between box a and the floor is 0.3. A worker applies a force of 600 N to box b parallel to the floor, and the stack moves together along the floor. Which of the following could be the coefficient of static friction between box a and box b?

1) 0.7

2) 0.5

3) 0.4

4) 0.3

5) 0.1

## Homework Equations

Ffriction = mu * Fnormal

## The Attempt at a Solution

I have no idea how to solve for the coefficient of friction between the two boxes. If it was between the floor and the combination of the two boxes, I would have treated the boxes as one and then find the resulting coefficient of friction.

Could anyone please help me get started and solve this problem?

Thanks a lot!