A 20 kg box rests on a 35 deg ramp. The coefficients of static and kinetic friction are 0.75 and 0.45, respectively. What force up the ramp is required to:
A) Just start the box moving up the ramp
B) Slide the box up the ramp at a constant speed.
c) Accelerate the box up the ramp at 1.2m/s2