What if you pitched a baseball at 90% speed of light? - Quora
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Relativistic Baseball: What would happen if you tried to hit a baseball pitched at 90% the speed of light? : r/sports
Relativistic Baseball, by XKCD | Archived Innings
SOLVED:Calculate the magnitude of the force required to give a 0.145-kg baseball an acceleration a = 1.00 m/s^2 in the direction of the baseball's initial velocity when this velocity has a magnitude
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Stream Relativistic Baseball - extract from WHAT IF? by Randall Munroe, read by Wil Wheaton by Hodder Books | Listen online for free on SoundCloud