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 velocity of the body during the
whole journey is
(a) zero
b) 24 m/s
(C) 25 m/s
(d) none of these​

Answer 1

Answer:

B

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                                      Please please please mark me as brainlest answer.