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I removed this because the pitcher analogy is wrong. If the pitcher is moving forward at a constant velocity and continues throwing balls, he still releases 1 ball per second, but the balls simply move with a faster velocity. It doesn't work because the speed of balls are not restricted to a certain velocity as they are for EM radiation or sound propagation through a medium. Yes, it could be stated that, "the balls move at a constant velocity", as if somehow restricted from moving beyond some maximum speed limit relative to the ground, but that is so unintuitive that this analogy hurts way more than it helps.