Explain the difference between distance and displacement.
Some students take part in a 400-metre running race.
They complete one lap of an athletics track shown in Figure 1, finishing at the point where they started.
State the distance and displacements of the runners as they cross the finish line.
Student A and student B raced each other on the same 400 athletics track. Their distance-time graph is shown in Figure 2.
State which student won the race.
Explain your answer.
A third student runs the race in 110 s.
Calculate the average speed of the third student.Â
Give your answer to 2 significant figures.
 Â
 Â
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