An object is thrown directly upward from the ground. After t seconds, the position, in feet, of the object is given by s(t) = 63t - 16t2 a) At what speed was the object thrown upward? b) At what times was the object moving up? c) At what times was the object moving down? d) What is the maximum height attained? At what time did the ball reach its maximum height? e) When did the object hit the ground? f) At what speed did the object hit the ground? g) What is the acceleration of the object