Problem Statement | After taking a physics course, Benny the beaver constructed a device as shown below. Benny is ini- tially on top of the box m1. There is friction between the box m, and the surface that it rests on. Benny is wearing his low- friction boots so there is negligible friction between Benny and the box m1. Benny's mass is my = 20 kg, the box's mass is m1 = 30 kg, and the coefficients of friction between the box and the floor are Uk = 0.11 and us = 0.30. What is the maximum force that Benny can pull down on the rope with before the box m, begins to slide? Ceiling mz