19. A particle moves in a straight line for 20 seconds with velocity 3 m/s and then moves with velocity 4 m/s for another 20 seconds and finally moves with velocity 5 m/s for next 20 seconds. What is the average velocity of the particle?
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Answer:
avarage velicity=total displacement ÷ total time
1st body dise =60
2nd body displ=80
3rd bidy disp=100
total displacement is 60+80+100= 240
total time is 20+20+20=60 sec
av =240÷60
=4 m/s
Explanation:
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