Final answer:
The question pertains to Physics and involves calculating resultant forces and work done, which require understanding of force interactions and energy. Using formulas and substitution, physics principles allow for the quantification of these parameters in practical situations.
Step-by-step explanation:
The question asked by the student requires a calculation of forces, work, and understanding the basics of statics and dynamics. This falls squarely within the realm of Physics.
Example Calculation of Resultant Force
If a man applies a force of 5 N on a crate, and the crate pushes back with a force of 2 N, the resultant force can be found by subtracting the force exerted by the crate from the force applied by the man, which gives us a resultant force of 3 N (5 N - 2 N).
Work Done on a Ramp
To calculate the work done by a man pushing a crate up a ramp, we use the formula work done (W) = force (F) x distance (d) x cos(θ), where θ is the angle of the ramp with the horizontal. In this case, with a force of 500 N and moving the crate 4 m up a ramp at a 20° angle, the work done is 500 N x 4 m x cos(20°).