Work and distance: a graph

Three steady forces, $10\ \text{N}$, $25\ \text{N}$ and $40\ \text{N}$, each move an object up to $10\ \text{m}$ along the force. You will make the program find the work at every metre, read one value off the lines, and find the slope of a line. Then it draws the three lines.

The idea. $W = Fs$, so each line is straight and starts at zero. Its slope, the work for each metre, is the force itself.

Your tasks.

1. Inside the loop, work out W, the work done by the force F over the distance s, in joules.
2. Find w, the work done by the $25\ \text{N}$ force over $8\ \text{m}$, from the lists.
3. Find slope, the slope of the $40\ \text{N}$ line: the work at $10\ \text{m}$ minus the work at $0\ \text{m}$, divided by $10\ \text{m}$.