A Block Slides on a Rough Horizontal Surface from Point

question 20

Multiple Choice

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

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