An 800-N box is pushed up an inclined plane that is 4.0 m long. It requires 3200 J of work to get the box to the top of the plane, which is 2.0 m above the base. What is the magnitude of the average friction force on the box? (Assume the box starts at rest and ends at rest.)
a)ON
b)not zero but
c) greater than 400 N
d) 400 N less than 400 N
e) 800 N
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