In order to do work, the force vector must be

a. in a different direction than the displacement vector.

b. in the same direction as the displacement vector and the motion.

c. in a different direction than the acceleration vector.

d. in the same direction as the acceleration vector.

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy