A body moving in a straight line travels the first half distance at v1 and the second half distance at v2.What is the average speed for the whole journey
Answers
Answered by
8
Given,
First half time speed is V−1 and the second half speed is V
2
Let distance be 2d
For the first half t
1
=
V
1
d
For the second half t
2
=
V
2
d
So the total time is t=t
1
+t+2
=
V
1
d
+
V
2
d
d(
V
1
V
2
v
1
+v
2
)
Average speed is :
t
1
+t
2
2d
=
V
1
V
2
d(V
1
+V
2
)
2d
=
V
1
+V
2
2V
1
V
2
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Answered by
1
Answer:
Given,
First half time speed is V−1 and the second half speed is V
2
Let distance be 2d
For the first half t
1
=
V
1
d
For the second half t
2
=
V
2
d
So the total time is t=t
1
+t+2
=
V
1
d
+
V
2
d
d(
V
1
V
2
v
1
+v
2
)
Average speed is :
t
1
+t
2
2d
=
V
1
V
2
d(V
1
+V
2
)
2d
=
V
1
+V
2
2V
1
V
2
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