An object moves from point A to point B then to point C. It then moves back to point A. What is the displacement of the object?

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.