Practise Edexcel A-Level Physics motion graphs through displacement-time and velocity-time sketches, changing gradients, constant acceleration and simplified real-motion models.
A swimmer swims a 100 m race. A simplified displacement-time graph for the swimmer is shown.
To increase her initial speed, the swimmer began the race by gliding underwater for 15 m and then began to use her arms and legs. This was not represented on the simplified displacement-time graph.
Sketch onto the axes below to show the actual variation of displacement with time for the first 15 m of the race.
Time / s
Explain one other way in which the motion of the swimmer has been simplified when drawing the displacement-time graph.