Question

A body covers half of its journey at the speed of a m/s and the other half of the journey at the speed of b m/s. Calculate the average speed of the body for the whole journey

plz plz help guys ​

Answer 1

Answer:

Let the total distance be 2x.

For first half distance :

Speed is 20 m/s

Thus time taken t

1

=

20

x

For second half distance :

Speed is 30 m/s

Thus time taken t

2

=

30

x

Average velocity V

avg

=

t

1

+t

2

2x

⟹ V

avg

=

20

x

+

30

x

2x

=

20+30

2×20×30

=24 m/s