Question

2. A body travels half the distance with speed of 20 m/s and the other half with speed of 30 m/s. The average velocity of the body during whole journey is : (A) zero (B) 24 m/s (C) 23 m/s (D) None of these​

Answer 1

Step-by-step explanation:

hlo mate here's your answer

Correct option is

B

24 m/s

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