You push a file cabinet up a rough ramp tilted at 10.0 with horizontal at a constant speed of 1.50 m/s. The file cabinet has a mass of 30.0 kg and you are pushing with a 150 N force in the direction up along the ramp. It's moved 4.20 m up along the ramp. Use g = 10.0 m/s2. Assuming the system is cabinet+earth+ramp, match the answers with questions. K + Ug + Usp + Eth + Ech = Wexternal - What is the change in gravitational potential energy (Ug)? (Hint: what is y?) - What is the change in thermal energy (Eth)? H. What is the change in kinetic energy (K)? - What is the work done by the external force (Wexternal)? A. 630 J B. -219 J C. 219 J D. -411 J E. none of the given F. 411 J G. -630 J H. 0 J