Main Question or Discussion Point
You throw a rock. What is happening to that rock, and how is the energy transferred?
Sounds good!!!!When you throw a rock, the kinetic energy from your hand is transferred from your hand to the rock thereby accelerating the rock correct?
See EXAMPLES for some specific applications. In your example, the hand get's it's energy from muscles burning up calories to move the arm, hand, ball and also the brain to coordinate the activity......and so "biological" energy is converted to kinetic energy.The kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its current velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. Negative work of the same magnitude would be required to return the body to a state of rest from that velocity.