A particle moves in straight line in same direction for 20 seconds with velocity `3 m//s` and the moves with velocity `4 m//s` for another 20 sec and finally moves with velocity `5 m//s` for next 20 seconds. What is the average velocity of the particle?

Options

A. 3 m/s
B. 4 m/s
C. 5 m/s
D. Zero

Answer

B

Explanation

`v_(avg) = (20xx3 + 4 xx 20 + 5 xx 20)/(60)`
` = (60+80+100)/(60) = 24/6 = 4m//s`