A woman attempts to push a box of books that has mass 37.5 kg up a ramp inclined at an angle of 24.5 degrees above the horizontal. Assume that the coefficients of friction between the ramp and the box are unknown, and symbolize them by s and k. The force F applied by the woman is HORIZONTAL, i.e. parallel to the ground, not to the ramp. Part A) If s is greater than some critical value, the woman cannot start the box moving up the ramp no matter how hard she pushes. Calculate this critical value of s. Note: this critical value of s may be an unreasonably large value; i.e. something much larger than 1.0