Final answer:
The question involves Physics concepts related to forces and motion, specifically the dynamics of pushing a wheelbarrow up a ramp. The statement about the boy pushing with a force of exactly 100 N is false because it doesn't take into account the mechanical advantage of the ramp.
Step-by-step explanation:
The subject question is about a person pushing a wheelbarrow up a ramp, which involves concepts from Physics. Specifically, the question is related to dynamics, the study of forces and motion, and how they affect objects. To answer the question posed, one would need to apply Newton's laws, particularly the first law which deals with objects in motion at a constant velocity having balanced forces acting on them.
Regarding the statement that a boy must be pushing with a force of exactly 100 N because the ramp is 1.0 m high and 3.0 m long, this is false. Work done against gravity when lifting a 300 N object 1.0 m high is 300 N x 1.0 m = 300 J (Joules). Since the ramp is 3.0 m long, the force exerted along the ramp would not necessarily be 100 N because the ramp reduces the force needed to lift the object due to its mechanical advantage.
In general, calculation of work done and forces involved when an object like a wheelbarrow or a crate is moved up a ramp, requires understanding of the work-energy principle, mechanical advantage, and free-body diagrams which are all fundamental in Physics.