Question

A car travels equal distances in the same direction with velocities 60 km/hr, 20km/hr and 10 km/hr. what is the average velocity of the car over the whole journey of motion?

Answer 1

Answer:

18km/hr

Explanation:

Assume the equal distance it travels to be x.

Time taken while travelling at 60km/hr=x/60

Time taken while travelling at 20km/hr=x/20

Time taken while travelling at 10km/hr=x/10

Average velocity =total displacement /total time

Since it travels at three speeds covering equal distance, total displacement will be 3x

Average velocity =3x/(x/60+x/20+x/10)

Average velocity =3x/(x+3x+6x/60)

Average velocity =3x/(10x/60)

Average velocity =3x/(x/6)

Average velocity =3x×6/x

Average velocity =18km/hr

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Answer 2

Answer:

it helps you.............