I have a power curve relating to a turbo trainer I use on my bike.
I save my sessions on a website called strava using speed, cadence, heart rate and time.
Using the power curve I've been given I wish to calculate the gradient of the curve, providing me with a power calculation for a given speed.
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I've got a rough table of figures that can be used to plot a graph, but I can't remember the maths I need to work out the formula.
$ \begin{array}{c|r} \text{speed} & \text{power} \\ \hline 5 & 25 \\ 9 & 50 \\ 12.5 & 100 \\ 17 & 200 \\ 20.5 & 300 \\ 23 & 400 \\ 25 & 500 \\ 27 & 600 \\ \end{array} $
Thanks for any advice you can give me.. even better if you can provide the completed formula.