Question : A particle moves for 20 𝑠𝑒𝑐𝑜𝑛𝑑𝑠 with velocity 3 𝑚/𝑠 and then 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 : option (B)
Solution :
