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JEEMAIN and NEET
>>
Physics
>>
Class11
>>
Motion in a Straight Line
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Q)
A train travels first one third of the distance on a straight track with velocity
10
k
m
h
−
1
next one third with velocity
20
k
m
h
−
1
and the last portion with velocity
60
k
m
h
−
1
. What is the average velocity of the train for the whole journey ?
(
A
)
78
k
m
h
−
1
(
B
)
18
k
m
h
−
1
(
C
)
67
k
m
h
−
1
(
D
)
45
k
m
h
−
1
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