21. The fact that the applied force aFGcauses the box to move up a frictionless ramp at a constant speed implies that there is no net change in the kinetic energy: 0KΔ=. Thus, the work done by aFGmust be equal to the negative work done by gravity:
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.