this post was submitted on 17 Mar 2024
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If your leg has a mass of 2kg, 1.1×10^10 J of kinetic energy would require your leg to be moving at about ~~150~~ 100 km/second not faster than the speed of light.
TLDR: Their math is shit.
Yeah, their answer just intuitively seems very wrong. The ratio between the kid's weight and your foot's weight should be equal to the ratio between their final speed and your foot's required speed. Ridiculous.