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Discussion of Problem 1192. Ball in a Dream

It seems like that the author don't know the difference between speed and engery.
Posted by zhougelin 8 Sep 2004 19:42


Edited by author 08.09.2004 19:43
Re: It seems like that the author don't know the difference between speed and engery.
Posted by Vovka 21 Oct 2004 16:30
I don't think so.
T ~ V^2, assuming that gives ac
Re: It seems like that the author don't know the difference between speed and engery.
Posted by div 13 Sep 2006 17:22
hmm... i think the same. In each jump energy decreases K times, then (E = mv^2/2) speed decreases sqrt(k) times.
But my solution, which assuming that speed descreases k times (not sqrt(k)), got AC... Strange

Sorry for my poor English=)
Re: It seems like that the author don't know the difference between speed and engery.
Posted by Liu Cong 17 Aug 2007 22:09
No,you are wrong,it's correct.

Each time v decreases in sqrt(k) times,but we use Vx*Vy,so it decreases in k times.
Re: It seems like that the author don't know the difference between speed and engery.
Posted by Toyama Kazuha 5 Dec 2008 16:27
I agree with you

kinetic engergy decreases in K times
speed decreases in sqrt(K) times

Because E=1/2*m*v^2

Edited by author 05.12.2008 16:28