Suppose the two photographs, shown in Fig. 13.1 and Fig. 13.2, had
been taken at an interval of 10 seconds. If a distance of 100 metres is shown by 1 cm in these photographs, calculate the speed of the blue car.
Distance travelled by the blue car = 2 cm
And 1cm = 100 m (as given in the question)
2 cm = 200 m
Therefore, distance travelled by blue car = 200 m
Time taken = 10 sec
Speed of the blue car = distance/ time taken = 200/10s
Speed of the blue car = 20m/s