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Standard XII
Physics
Finding Average Velocity
A car travels...
Question
A car travels a certain distance at a speed of 50 km/h and returns with a speed of 40 km/hr. Calculate the average speed of the whole journey.
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Solution
To complete
1
k
m
distance with speed
=
50
k
m
h
r
it tkes time
t
1
=
1
50
s
To complete
1
k
m
distance with speed
=
40
k
m
h
r
it tkes time
t
1
=
1
40
s
Average speed
=
1
+
1
(
1
/
50
)
+
(
1
/
40
)
=
44.44
m
/
s
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