Timeline for I think I disprove this with kinematics, but energy says it is right

7 events

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Dec 31, 2011 at 12:54	comment	added	Ron Maimon		To make it intuitive that the speeds are the same, treat the vertical and horizontal components separately, and note that if you throw something up with a certain speed, when it comes down to its original height, it is going down with the same speed, so that the up and down ball are the same. For the horizontally thrown ball, you just need to know that the square of the vertical component is proportional to the height, but this is conservation of energy, and there is no better way to argue the equality.
Dec 31, 2011 at 0:33	vote	accept	Lemon
Dec 31, 2011 at 0:32	vote	accept	Lemon
Dec 31, 2011 at 0:32
Dec 31, 2011 at 0:17	history	edited	Lemon	CC BY-SA 3.0	mistake
Dec 31, 2011 at 0:11	history	edited	Qmechanic♦		It seems homework tag applies even if it is not actual homework;
Dec 31, 2011 at 0:09	answer	added	Steven D.		timeline score: 4
Dec 31, 2011 at 0:00	history	asked	Lemon	CC BY-SA 3.0