(i) Average velocity = 10 \over 4
= 2.5 ms-1.
Hence, average velocity of the car is 2.5 ms-1.
(ii) From the graph, we get,
Displacement = final position – initial position
Substituting the values from the graph, for the first 10 s, we get,
Displacement = -10 – 0 = -10 m
Hence, displacement from the initial position at the end of 10 s = – 10 m
(iii) The cyclist would reach the start point two times, one at the 7 s and the other at 13 s.