Question

. A body covers half the
distance with a speed of
20 m/s and the other half
with a speed of 30 m/s.
The average speed of
whole journey is
O 25 m/s
0
24 m/s
O
2.4 m/s
o zero​

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