A person moves from point A to point B which is at a distance of 10 km and returns to the same point A after an hour. The average velocity for motion is
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Explanation:
Correct option is
A
4
17
km/h and
4
13
km/h
Given AB=12 km(s
1
) and BC=5 km(s
2
)
Speed from A to B =4 km/h
Time taken t
1
=
4
12
=3 hr
Speed from B to C =5 km/h
Time taken to complete distance from B to C, t
2
=
5
5
=1 hr
Average speed =
t
1
+t
2
s
1
+s
2
=
3+1
12+5
=
4
17
km/h
AC=
(AB)
2
+(BC)
2
=
144+25
=
169
=13 km
Average velocity =
4
13
km/h
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