A particle moves in a straight line for 20 seconds with velocity 3m/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 ?
A. 3 m/s
B. 4 m/s
C. 5 m/s
D. zero
Answer:B
A particle moves in a straight line for 20 seconds with velocity 3m/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 ?
A. 3 m/s B. 4 m/s C. 5 m/s D. zero