1. ## motion

An objects position equations:

x=3t^2-6t
y=t^3-3t

x'=6t-6
y'=3t^2-3

When at rest v=0=sqr root of (x'^2 +y'^2)

It does not appear to ever be at rest. Is that correct? The question asks when is the object at rest.

2. ## Re: motion

Originally Posted by Stuck Man
An objects position equations:
x=3t^2-6t, y=t^3-3t
x'=6t-6, y'=3t^2-3
When at rest v=0=sqr root of (x'^2 +y'^2)
It does not appear to ever be at rest. Is that correct? The question asks when is the object at rest.
Well it is true that if $t=1$ then $v=0$ is it not?

3. ## Re: motion

I found my mistake in the arithmetic.