A car is travelling along a straight line. It covers
one-half of the total distance with a velocity
10 ms. The remaining part of the distance was
covered with a velocity 12 ms-'. for half the time
and with velocity 16 ms-' for the other half the
time. Find the average speed over the whole time
of motion
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3
Answer:
Let total distance d
Let time covered for first one third distance bet
1
Then t
1
=
4
d/3
=
12
d
t
2
be time for next two journeys
d−
3
d
=
3
2d
=2t
2
+6t
2
=8t
2
t
2
=
12
d
Averagevelocity=
Totaltime
Totaldistane
=
t
1
+2t
2
d
=
12
d
+
12
2d
d
=4m/s
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