Ellen drops a ball from a cliff. Which statement best describes the ball's energy as it falls from her hand?
a
The ball's kinetic energy decreases while its potential energy increases.
b
The ball's potential energy decreases while its kinetic energy increases.
c
The ball's potential energy is changed to thermal energy.
d
The ball's kinetic energy increases but its potential energy remains the same.
b
The ball's potential energy decreases while its kinetic energy increases.