Question

Suppose the two photographs, shown in Figure 1 and Figure 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 fastest car.

Figure 1 Vehicles moving in the same direction on a road

Figure 2 Position of vehicles shown in Figure 1 after some time

Answer 1

The distance covered by the blue car (as evident from the photograph) from one white strip to another, measured by scale, is 1.4 cm.

It is given that 1 cm is equivalent to 100 m.

Therefore, 1.4 cm is equivalent to 140 m.

Distance travelled by the car = 140 m

The time interval between the two photographs = 10s

Speed = `"Distance covered"/"Time taken"`

= `140/10`

= 14 m/s