Using Newtonian physics, physicists have found an expression for the value of kinetic energy, specifically KE = ½ m v^2. Einstein came up with a very different expression, specifically KE = (gamma – 1) m c^2. In this video, Don Lincoln shows how these two equations are the same at low energy and how you get from one to the other.
From CNN, August 2, 2021: Don Lincoln describes the mastery of physics Olympic athletes have as demonstrated by their physical feats. Read more about how Olympic athletes apply the principles of physics and use amazing amounts of energy, skill and precision to run, throw a discus, balance on the balance beam or launch the javelin.