Question 9 (Mandatory) (10 points) A ball is thrown straight down form the top of a 210-foot building with an feet per second. (a) Find the position and velocity functions for the ball. (b) Find the average velocity over the interval [1, 2]. (c) Find the instantaneous velocities when t = 1 and t = 2. (d) How long will it take the ball to hit the ground? (e) Find the velocity of the ball when it hits the ground. Question 9 options