Awesome science experiment

My little lass' science homework was an experiment where you tie an elastic band between two chair legs and use it to launch a toy car across the kitchen floor. You had to pull the car a bit further back each time and write down the results, which were as follows:

Stretch/distance travelled (centimetres):
3 - 9
4 - 15
5 -23
6 -39
7 -44
8 -65
9 -89
10 - 104
11 - 119
12 - 150
13 - 172
14 - 207
15 - 226

I admit that we did a tiny little bit of applied climate science and redid two or three of the tests to get the readings to fit the model, but they still filled my mathematically minded heart with joy.