A particle is acted upon by only two forces, one conservative and one nonconservative and neither being a force of friction, as it moves from point A to point B. The kinetic energies of the particle at points A and B are equal if
A) the sum of the works of the two forces is zero.
B) the work of the conservative force is equal to the work of the nonconservative force.
C) the work of the conservative force is zero.
D) the work of the nonconservative force is zero.
E) None of the above.

Question

Quizplus · Accepted Answer

When the sum of the works of the two forces (conservative and nonconservative) is zero, the total mechanical energy of the system remains constant, implying that the kinetic energy at points A and B would be equal, assuming no other energy transformations.

A Particle Is Acted Upon by Only Two Forces, One