Problem 7.4

Please wait for the animation to completely load.

A 12-kg box slides down a rough 26.56° ramp at constant speed (it is already traveling at this constant speed at t = 0 s and continues to do so even after the animation ends) as shown in the animation (position is given in meters and time is given in seconds).  Note that friction does work on the box.  Restart.

1. What is the work done by friction (done on the box and the ramp) during the animation? 
2. What is the change in gravitational potential energy of the box during the animation? 
3. What is the change in kinetic energy of the box during the animation? 

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