1.

Two cars a and b race each other the car for 2 minutes at a speed of 7.5 km per hour 56 minutes against time for 2 years at a speed of 7.5 km per hour find the average speed of the car in the race

Answer»

Answer:

7.5

Explanation:

Day and NIGHT, changing phases of the moon, beating of heart, clock STRIKING an hour are all examples of periodic MOTION whereas water becoming ice, burning of matchstick etc are non periodic CHANGES. Changes which are repeated after regular INTERVALS are called periodic changes.



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