As an object moves from point A to point B only two forces act on it: one force is nonconservative and does −30 J of work, the other force is conservative and does +50 J of work. Between A and B,
◦ the kinetic energy of object increases, mechanical energy decreases.
◦ the kinetic energy of object decreases, mechanical energy decreases.
◦ the kinetic energy of object decreases, mechanical energy increases.
◦ the kinetic energy of object increases, mechanical energy increases.
◦ None of the above.
the kinetic energy of object increases, mechanical energy decreases.