Suppose the two photographs, shown in figures given below, 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 car marked A.

**Answer:**

The distance covered by the car from one strip to another, which is measured by scale is 1.4 cm

Given, 1 cm is equivalent to 100 m.

Therefore, 1.4 cm is equivalent to 140 m

Distance travelled by the car = 140 m

Time interval between the two photographs = 10 s Speed