Final answer:
The student's question is about calculating the force needed to move a 3000lb load down a ramp with a 15 percent grade, which is a Physics problem related to forces on an incline.
The correct option is d.
Step-by-step explanation:
The student's question pertains to the subject of Physics, particularly focused on Newtonian mechanics and the concept of forces acting on an object on an incline. The scenario involves calculating the force required to drive or move a 3000lb load down a 15 percent grade ramp.
Using the principles of physics, we know how to resolve the weight of the load into components parallel and perpendicular to the incline. The parallel component contributes to the force required to move the load down the ramp.
A 15% grade suggests that for every 100 units of horizontal distance, the elevation changes by 15 units. This grade can be used to calculate the angle of the incline when necessary. Furthermore, statements like the one involving a boy pushing a 300 N box claim that specific values of force equate to the work done, but require validation against the concept of mechanical work and the actual incline of the ramp.
The correct option is d.