An object is moving according to the position function s(t} = 2t3 + 3t1 36t + 10, where s is in meter and t 2 U is in second. a} What is its acceleration when it is 18 m from the origin? b) At what time will the object stop momentarily? Where will it be at that time'? c} Give the interval of time when the object will move forward (or to the right) and when the object wilt move backward (or to the left}