(Solved): A proton moves in a horizontal line. Its position, t seconds after the particle begins moving is: s ...

A proton moves in a horizontal line. Its position, $$t$$ seconds after the particle begins moving is: $$s(t)=3t^3?2t+9$$ A. Find the velocity of the proton at time $$t$$. B. After the proton starts moving, it comes to a rest at what time $$t$$ ? You may give your answer to 3 decimal places. In your work, give an appropriate unit. C. Find the acceleration of the proton at time $$t$$. D. Find the accleration of the proton 2 seconds after it begins moving. In your work, give an appropriate unit.