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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
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Solution
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
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