A particle moves for 20 seconds with velocity 3 mls and then relocity Amls for another 20 seconds moves with velocity 5mls for next 20 seconds. What is the average velocity of the particle?
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Answer:
Total distance covered by particle d=v
1
t
1
+v
2
t
2
+v
3
t
3
∵t
1
=t
2
=t
3
=20sec
d=20(3+4+5)= 240 m
Total time, T= 3×20 =60sec.
Avg velocity v=
T
d
=
60
240
=4 m/s
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