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

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 :

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
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