A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P = 5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force P between A and B?
A)2.7 J
B)1.0 J
C)2.2 J
D)1.6 J
E)3.2 J

Question

A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P = 5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force P between A and B? 
A)2.7 J 
B)1.0 J 
C)2.2 J 
D)1.6 J 
E)3.2 J

Quizplus · Accepted Answer

The Answer is C

A Block Is Pushed Across a Rough Horizontal Surface from Point