A block slides on a rough horizontal surface from point A to point B. A force (magnitude P = 2.0 N) acts on the block between A and B, as shown. Points A and B are 1.5 m apart. If the kinetic energies of the block at A and B are 5.0 J and 4.0 J, respectively, how much work is done on the block by the force of friction as the block moves from A to B?
A. ?3.3 J
B. +1.3 J
C. +3.3 J
D. ?1.3 J
E. +4.6 J
Answer: A
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