Answer Happy

Could anyone help me with this.
6. Explore the motion. Why is the resultant acceleration vector pointing only up when the object is at the lowest position? Calculate the magnitude of the centripetal acceleration at this location. Show work. a. Why is the magnitude of centripetal acceleration zero at the max displacements? b. Is the magnitude of the centripetal acceleration constant as the object moves back and forth? Support your answer. C. Is the magnitude of tangential acceleration constant as the object moves back and forth?