The path is flat by default, and mostly flat by initial expression. So it might not strike someone that the shape of the path is a mountain shape.
Perhaps "the shape of a path down a mountain" would make everyone happy.
Perhaps "the shape of a path down a mountain" would make everyone happy.
If they'd just said the above, and I think not shown the value of t, it would have been a lot clearer, at least to me.
If in later levels they show formula(s) using gravity, and perhaps show the skier on different planets, with different values of G, then I can see the value in showing the value of t. But as it is, I think it's confusing.