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39. A 4.0-kg block is lowered down a 37° incline a distance of 5.0 m from point A to point B. A horizontal force
10 N) is applied to the block between A and B as shown in the figure. The kinetic energy of the block at
A is 10 J and at B it is 20 J. How much work is done on the block by the force of friction between A and B?
B
370
a. -58 J
b. -53 J
⠀
c. -68 J
d. -63 J
e. -47 J

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