Aperson standing on the roof of a building throws a ball directly upward. the ball misses the rooftop on its way down andeventually strikes the ground. the function5(1) - - 16: 1 + 64! + 80describes the ball’s height above the ground, sit), in feet, tseconds after it was thrown. a. fund the balls average velocity between the time it was thrown and 2 seconds later. b. find the ball’s average velocity between 2 and 4 seconds after it was thrown. c. what do the signs in your answers to parts (a) and (b) mean in terms ofthe direction of the ball’s motion?