Kinetic energy is dependent on the object's mass and velocity. Since kinetic energy is the energy of motion, all objects that have motion have potential kinetic energy. This energy is determined by the size of the object, where the object is and the speed or velocity it is moving at.
Kinetic energy is directly proportional to the square of its velocity or speed. If an object has a speed of two squared, then the kinetic energy will have a twofold increase with a factor of four. A good example of kinetic energy is holding two magnets apart. When held apart, they have the potential to be released and moved together, doing work in the process of moving. If a person is standing at the top of a building, they have more potential energy than if they were standing on the sidewalk below it. This is because gravity could pull that person or object down. When this occurs, the gravity is doing work on the object. The speed at which the object falls or the magnets move are directly related to their mass. Bigger objects will fall faster and larger heavier magnets will move towards each other more slowly than smaller magnets would if the magnetic charge was the same.