A 0.40-kg particle moves under the influence of a single conservative force.At point A where the particle has a speed of 10 m/s,the potential energy associated with the conservative force is +40 J.As the particle moves from A to B,the force does +25 J of work on the particle.What is the value of the potential energy at point B?
A)+65 J
B)+15 J
C)+35 J
D)+45 J
E)-40 J

Question

Quizplus · Accepted Answer

The work-energy principle states that the work done by the force is equal to the change in kinetic energy plus the change in potential energy. Since the force is conservative, the work done is also equal to the negative change in potential energy. Thus, the potential energy at B is 40 J - 25 J = 15 J.

A 040-Kg Particle Moves Under the Influence of a Single Conservative