Force and motion, step by step

A car has a mass, an engine force and a resistance. You will make the program find the net force and the acceleration with Newton's second law, then step time forward in small pieces to follow the speed and the distance, and find when the car reaches $15\ \text{m/s}$.

The idea. $a = \dfrac{\text{net force}}{m}$. In each small time step $dt$, the speed grows by $a \times dt$ and the car moves $v \times dt$.

Your tasks.

1. Work out the net force net and the acceleration a.
2. Inside the loop, update the speed v and the distance s.
3. Find t15, the first time on the list when the speed reaches $15\ \text{m/s}$.