# 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.

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  $20\ m/s$

## Related Chapters

### Preparation Products

##### JEE Main Rank Booster 2021

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 13999/- ₹ 9999/-
##### Rank Booster NEET 2021

This course will help student to be better prepared and study in the right direction for NEET..

₹ 13999/- ₹ 9999/-
##### Knockout JEE Main April 2021 (Easy Installments)

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 4999/-
##### Knockout NEET May 2021

An exhaustive E-learning program for the complete preparation of NEET..

₹ 22999/- ₹ 14999/-