2 The graph shows the resistance force experienced by a cyclist over the first 20 metres of a bicycle ride.
\includegraphics[max width=\textwidth, alt={}, center]{86bfb16f-4df3-4105-8343-e8c4ae862f27-02_572_1381_1320_328} Find the work done by the resistance force over the 20 metres of the bicycle ride. Circle your answer.
[0pt] [1 mark]
1600 J
3000 J
3200 J
4000 J A formula for the elastic potential energy, \(E\), stored in a stretched spring is given by $$E = \frac { k x ^ { 2 } } { 2 }$$ where \(x\) is the extension of the spring and \(k\) is a constant.
Use dimensional analysis to find the dimensions of \(k\).