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

Question

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

Quizplus · Accepted Answer

The Answer is A

A Block Slides on a Rough Horizontal Surface from Point