Answer Happy

A delivery truck from the postal service is traveling with constant velocity up an interstate entrance ramp with a 6.5° slope. A 60 kg box sits on the floor of the truck and as a result of static friction, it does not slide.
(a)
During an interval in which the truck travels 370 m up the ramp entrance, what is the net work done (in J) on the box?
0
Correct: Your answer is correct.
J
(b)
What is the work done (in J) on the box by the force of gravity?
Incorrect: Your answer is incorrect.
Knowing that the gravitational force is conservative, can you relate the work done by gravity to the change in gravitational potential energy? J
(c)
What is the work done (in J) on the box by the normal force?
0
Correct: Your answer is correct.
J
(d)
What is the work done (in J) on the box by the force of friction?
Incorrect: Your answer is incorrect.
Since the truck is traveling at a constant speed, how does the work done on the box by nonconservative forces (friction) compare to the change in gravitational potential energy? Give some thought as to why in this case the
does not slide. (a) During an intivei in which the truck travels 370 m up the ramp entrance, what is the net work done (in 习 on the box? 13 (b) What is the work done (in 3) on the bak by the force of gravity? x. Mriowing that the grayitatenal forch is conservative, can you relate the work done toy gravity to the change in gravitatianal potential energy? 3 (c) What is the work done (in J) on the bax-y the normal force? (d) What in the work done ( in 1) en the bex by the force of triction?