An object's motion changes
a.
only when a nonzero net force is applied to the object.
b.
only if the object is at rest when a force acts upon it.
c.
when the forces acting on the object remain balanced.
d.
when there are no forces acting upon it.

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.