Question

an object covers half the distance with the speed of 20 metre per second in the other half with the speed of 30 metre per second the average speed of the whole journey is
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Answer 1

Answer:

24 m/s

Explanation:

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