Suppose the two photographs, shown in figures given below

cbse
cbse-class-7-science
motion-and-time

#1

Suppose the two photographs, shown in figures given below, 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 car marked A.
image

Answer:

The distance covered by the car from one strip to another, which is measured by scale is 1.4 cm
Given, 1 cm is equivalent to 100 m.
Therefore, 1.4 cm is equivalent to 140 m
Distance travelled by the car = 140 m
Time interval between the two photographs = 10 s Speed
image