All steps and answer within the explanation (not pdf)

A particle moves according to the law of motion s = t' - 6t2, t > 0, where t is measured in seconds and s in feet. (a) Find the average velocity over the interval [1, 2] Answer: -11 Co (b) Find the velocity at time t. Answer: I ft S (c) What is the velocity after 4 seconds? ft Answer: S (d) What is the acceleration after 7 seconds? ft Answer: (e) For t > 0, when is the particle moving in the positive direction? Answer: E