HW Score: 76.85%, 13.83 of 18 points Homework Question 17, 1.2.101 Part 1 of 2 O Points: 0 of 1 A ball is thrown vertically upward from the top of a building 64 feet tall with an initial velocity of 48 feet per second. The distance s (in feet) of the ball from the ground after t seconds is s = 64 + 48t - 16t2. (a) After how many seconds does the ball strike the ground? (b) After how many seconds will the ball pass the top of the building on its way down? (a) After how many seconds does the ball strike the ground? t= seconds