Interactive applet exploring average and instantaneous rates of change using GeoGebra Graphing Calculator with animation.
In the first applet, it shows an observer standing on the cliff watching a hot air ballon moving rise and fall. The applet displaces the average rate of accent, i.e. average rate of change of the balloon's height, between two different moments in time
The Graph provides information on the average rate of change and instantaneous rate of change and their relation using secant and the tangent line in the second applet.