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
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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
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