A large box with mass 45 kg is being pushed up a ramp at a 32 degree incline at a constant velocity by a man pushing parallel to the incline of 7.80 m. If the coefficient of kinetic friction is 0.25, what is:
a. the force the man is pushing on the box
b. the work done by a man on the box
c. the force of friction
d. the work done by the friction force.