Powering Up Relativistic Baseball

There’s a cute post on the consequences of a pitcher throwing a baseball at 90% of the speed of light (see Relativistic Baseball).  (cute for geeky people like me, at least).  The author assumes that the baseball somehow accelerates from rest to 90% of light speed without worrying about how that occurs.  But, as a chemical engineer I have to wonder about the energy requirements for achieving 0.9c, so I did a calculation on the change in kinetic energy of a baseball from rest. Continue reading