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relativistic kinetic energy is a very special equation derived by the genius Albert Einstein in 1905. This equation defines kinetic energy at velocities near the speed of light, very, very, very fast motion. In our everyday life at very low velocities we calculate kinetic energy using Newtonian kinetic energy - a different equation. The question: Does Einstein's relativistic Kinetic energy equation equal to the Newtonian kinetic energy equation if the velocities are at much smaller values than the speed of light? Below (somewhere on this page), in "Einstein's beautiful equations" video, I derived that Relativistic Kinetic energy equation using work done. Let's see if Einstein and Newton equations agree at velocities much less than the speed of light!
http://www.youtube.com/watch?v=gpOe24xd7q8