A particle travels one third of total distance of the journey with speed 10 m/s the next one third of total distance with speed 20 m/s and the remaining distance with speed 40 m/s the average speed of the particle of journey is
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Explanation:
Average speed=
total time taken
total distance covered
At the total distance=3x
Time taken to cover first one third(x)
=t
1
=
v
1
x
Time taken to cover second one third=t
2
=
v
2
x
Time taken to cover 3
rd
one third=t
3
=
v
3
x
Average speed=
v
1
x
+
v
2
x
+
v
3
x
3x
=
v
1
1
+
v
2
1
+
v
3
1
3
.
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