# Homework Help: Physical asymptote

1. Feb 1, 2015

### LagrangeEuler

1. The problem statement, all variables and given/known data
For example particle performs a motion in x-y plane. In y there are walls from both side so particle can go in y direction from zero to $$h$$. I need to plot trajectory. If I got trajectory $$y=x^4-x^2$$ then
$$\lim_{x\to \infty}y(x)=\infty 2. Relevant equations 3. The attempt at a solution If I got trajectory [tex]y=x^4-x^2$$ then
$$\lim_{x\to \infty}y(x)=\infty$$, but because of the condition I may say that $$\lim_{x\to \infty}y(x)=h$$. Maybe then $$y=h$$ is some natural horisontal asymptote?

2. Feb 1, 2015

### Goddar

Hi. It's hard to understand what your problem exactly is. Could you clarify it maybe by giving its original statement?
If you are asked to plot a two-dimensional trajectory parametrized by:
y = x4–x2,
Under the constraint: ymax= h,
Then it gives you a natural constraint on x as well, as a function of h; if you need to plot this you'll have to assign an arbitrary value to h so that you can plot something.
Now depending on this value, your plot will not always look the same but that's all you can do with the given information...