Heres question I need help with. I'm in Grade 11 Physics. A ball is thrown vertically upward from a window that is 3.6 m above the ground. The ball's initial speed is 2.8 m/s and the acceleration due to gravity is 9.8 m/s^2. a) What is the ball's speed when it hits the ground? b) How long after the first ball is thrown should a second ball be simply dropped form the same window so that both balls hit the ground at the same time? I don't know where to start. I have tried an equation but it keeps seeming to be the wrong answer. I get approx 8.9 m/s [down] for a).