First of all the reason the graph would be a curve is because, as the time increases the position changes, at first the ball is at a certain point then it starts rolling off a cliff so its moving foward and then the ball starts falling, (If too confusing here is a image http://www.mazzworld.net/U11Image1.gif)
The legs of an insect are used to taste things walk jump and climb. wings are for flying and sometimes camouflage The mouth parts are for piercing and sucking their prey