Question

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.

Answer 1

From the figures 13.1 and 13.2, we conclude that the distance covered by blue car is 2 cm.

So, the distance covered = 2 × 100 m = 200 m
Time taken = 10 seconds 

Speed= Distance/Time = 200 /10 =20 m/s