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In Fig. 8-49, a block slides down an incline. As it moves from point A to point B, which are 7.2 m apart, force acts on the block, with magnitude 4.4 N and directed down the incline. The magnitude of the frictional force acting on the block is 5.5 N. If the kinetic energy of the block increases by 32 J between A and B, how much work is done on the block by the gravitational force as the block moves from A to B?
http://edugen.wiley.com/edugen/courses/crs1062/art/qb/qu/c08/Fig08_49.gif
http://edugen.wiley.com/edugen/courses/crs1062/art/qb/qu/c08/Fig08_49.gif