In a closed system that has 45 J of mechanical energy, the gravitational
potential energy of a ball rolling down an inclined plane decreases from 8 J to
5 J. How does the system's kinetic energy change if there is no friction??
O A. It increases from 45 J to 50 J.
B. It decreases from 40 J to 37 J.
O C. It decreases from 48 J to 43 J.
D. It increases from 37 J to 40 J.​