Hello.
I'm thinking about the following problem.
In the playground, you have a "thing" (slide? I don't know the word, but
kids useually slide down on this).
The shape of the slide that the kids follow during the slide, can be
described in a x-y coordinate system like:
y(x)=1-x^2, 0<=x<=1 (this would be a quite dangerous slide).
How can I describe the movement of the kid sliding along this path?
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