In the Figure,a Constant External Force P = 160 N

question 2

Multiple Choice

In the figure,a constant external force P = 160 N is applied to a 20.0-kg box,which is on a rough horizontal surface.While the force pushes the box a distance of 8.00 m,the speed changes from 0.500 m/s to 2.60 m/s.The work done by friction during this process is closest to

• A) -1040 J.
• B) +1110 J.
• C) +1170 J.
• D) +1040 J.
• E) -1170 J.