What is the difference between potential energy and kinetic energy?

a. Potential energy is energy of an object due to its position, while kinetic energy is due to its motion.
b. Potential energy is the energy of an object due to its motion, while kinetic energy is energy due to its position.
c. Potential energy is energy of an object due to an applied force, while kinetic energy is energy stored after the applied force.

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.