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Question 11
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

First, measure the distance covered by the blue car with the help of a scale and then proceed as given below.
Suppose the distance measured by scale is 2 cm.
Multiply 2 with 100 to get the actual distance = 2 × 100 = 200 m.    (1cm = 100m)
Interval time between the photos taken = 10 s
Speed of the blue car = 20010ms=20ms


Physics
NCERT Textbook
Standard VII

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