Question

Solve any four of the following:


1) A boy walks from his home to a post office at a distance of 0.5km in 20min. He then returns to his

home in time 25min. Find the average speed of the boy.


2) On earth the weight of a body of mass 1kg is 10N. What will be the weight of a boy of mass 37kg

in (a) kgf (b) N?


3) A cyclist travels a distance of 1km in the first hour, 0.5km in the second hour and 0.3km in the

third hour. Find the average speed of the cyclist in (a) km/h (b) m/s?


4) During a thunderstorm, the thunder is heard 2.5 second after the flash of lightning is seen. If the

speed of sound is 330 m/s, find the distance at which lightning took place.


5) A boy fires a gun and another boy at a distance of 1020 m hears the sound of firing the gun 3 s after

seeing its smoke. Find the speed of sound.

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Answer 1

Answer:

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