An external force moves a $3.50$ -kg box at a constant speed up a frictionless ramp (Figure 6-46). The force acts in a direction parallel to the ramp. (a) Calculate the work done on the box by this force as it is pushed up the $5.00$ -m ramp to a height of $3.00 \mathrm{~m}$. (b) Compare the value with the change in gravitational potential energy that the box undergoes as it rises to its final height. Example $6-10$