Which statement best describes the relationship between gravitational potential energy and kinetic energy in an object falling freely under gravity?
a. The gravitational potential energy increases while kinetic energy decreases.
b. The gravitational potential energy is converted into kinetic energy.
c. Both gravitational potential energy and kinetic energy remain constant.
d. The kinetic energy is converted into gravitational potential energy.

When an object falls freely under gravity, its gravitational potential energy decreases as it descends (since it moves closer to the center of the Earth), while its kinetic energy increases (as its velocity increases due to acceleration).

This conversion of gravitational potential energy into kinetic energy is described by the law of conservation of energy.

Therefore, b) "The gravitational potential energy is converted into kinetic energy," best describes the relationship between gravitational potential energy and kinetic energy in this scenario.