Which of these is exhibiting kinetic energy?

A. A space station orbiting Earth

B. A rock on a mountain ledge

C. An archer with a flexed bow

D. A person sitting on a couch while watching TV

E. The high-energy phosphate bonds of a molecule of ATP

Answer: A

A space station orbiting Earth

Explanation

Kinetic refers to the energy related to motion.  The kinetic energy of an object is defined as the amount of work required to bring that object a state of motion from a state of rest. The kinetic energy of an object with mass, m moving at speed, v, is given by the equation.

K=1/2mv²

An objects exhibits energy only if v≠0 that is,  it is a state of motion. From all the options given only the space station is in motion.