Question : For a particle moving in a straight line, the displacement of the particle at time 𝑡 is given by 𝑆 = 𝑡 3 − 6𝑡 2 + 3𝑡 + 7. What is the velocity of the particle when its acceleration is zero?
(A) -9ms^{-1}
(B) -12ms^{-1}
(C) 3ms^{-1}
(D) 42ms^{-1}
Answer : option (A)
Solution :
