1. The problem statement, all variables and given/known data Two crates are stacked on top of each other on a horizontal floor. The coefficient of static friction between Box A and Box B is 0.6. The coefficient of static friction between Box A and the floor is 0.2. A force of 100 N is applied parallel to the floor on Box B. The boxes move together along the floor. The ratio of the mass of Box A to Box B is possibly 1) 5:1 2) 5:2 3) 4:1 4) 3:1 5) 1:2 2. Relevant equations none so far 3. The attempt at a solution Hi people. I was trying to figure out how to solve this problem, but I do not even have any hints of an idea so far. Could anyone please help me gets started? Thanks in advance!