11 The equation of motion when throwing something vertically upwards is given by the formula It) = 1+ v.x1-4gxr. where he is the initial height above the ground, v. is the initial upward speed and 9 (= 9.81 ms ?) is the acceleration due to gravity. Consider someone standing on the roof of a building 21'm tall, who throws a ball vertically upwards with an initial speed of 15 ms. a Sketch the graph of the height of the ball against time. b Determine the maximum height that the ball will reach. c Determine how long the ball will need In order to fall to the ground