2) The position function of a moving object is s(t) = ti(7 - t), where 0 s t s 20. The position s(t) is given in metres and time t, in seconds. [14 MARKS] a. Calculate the object's velocity at any time t. b. When does the object return to its original position? c. When does the motion of the object change direction? d. When does the object move away and when toward the starting point. e. Calculate the object's acceleration at any time t. f. When is the acceleration positive, and when is it negative? g. Determine the time intervals when the object is speeding up or slowing down