11. 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 fastest car.

Answers (1)

Given, Scale: 1\ cm = 100\ m

The blue car is the fastest.
Distance travelled by the blue car in the picture= 2\ cm
\therefore 2\ cm = 200\ m

Therefore, actual distance travelled by blue car = 200\ m

Time taken = 10\ sec

Speed of the blue car = \frac{distance}{time\ taken}

= \frac{200}{10} = 20

Therefore, Speed of the blue car is  20\ m/s

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