Can I have some tips on where to start this problem? I have no work because I can see no work to do. "A wooden box is placed on the left end of a 3.60-m long plywood ramp. The left end of the ramp is raised until the box begins to slide. What is the magnitude of the acceleration of the box after it starts to move?" This is all the information. I have no way to find the coefficent of friction, no angle, and no mass for the box.