2. Imagine a monkey, encased in a ball. Then shrink that, let's call it a "monkey ball", down to the size of a particle. The monkey ball moves on a vertical line so that its coordinate at time tis y = t3 - 12t + 3, t 2 0. [10 points] . Find the velocity and acceleration functions of the monkey ball. . During the monkey's travels, he starts and stops. At what value of t does the monkey stop to change directions