Ncert solutions

Question 10

Q11) Suppose the two photographs, shown in Fig (1) and Fig (2), had been taken at an interval of 10 seconds.

If a distance of 100 meters is shown by 1 cm in these photographs, calculate the speed of the blue car.

Solution:

The distance measured is 2cm.

So, the distance covered d = 2 x 100= 200m. (Because according to scale, 1cm=100m).

Time taken = 10seconds.

Speed = (Distance/Time) = (200m/10s) = 20m/s.

Therefore the speed of the blue car = 20m/s.

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