alt Hacker NewsThat ends up begging the question, because the next step is "how high do you have to drop it from so that it's travelling twice as fast?" and you're immediately going round in circles.
That ends up begging the question, because the next step is "how high do you have to drop it from so that it's travelling twice as fast?" and you're immediately going round in circles.
Nothing of the sort. The seesaw can be in space far from gravitational influences. Potential energy is extraneous in this explanation.