For numbers 14-18. Stephen Curry released a ball upward at a certain height. Its height (in ft) from the ground at any time t (in seconds) is given by s(t) = 50 + 15t - 5t- 14. What is the height at which the ball was released. a. 30 ft b. 40 ft c. 50 ft d. 60 ft 15. Find the time when the ball hits the ground. a. 3 seconds b. 4 second c. 5 seconds d. 6 seconds 16. What is the average velocity of the ball on the interval of [2, 3]? a. 60 ft/s b. 50 ft/s c. 10 ft/s d. -10 ft/s 17. What is the instantaneous velocity at t = 2 and t = 3? a. t = 2 and t = 3 are -5 ft/s and -15 ft/s respectively. b. t = 2 and t =3 are -15 ft/s and -5 ft/s respectively. c. t = 2 and t = 3 are 5 ft/s and 15 ft/s respectively. d. t= 2 and t = 3 are 15 ft/s and 5 ft/s respectively. 18. What is the instantaneous velocity at any time to. a. (15 - 10to)ft/s b. (15 + 10to)ft/s c. (10 - 15to)ft/s d. (10 - 15to)ft/s 19. Which of the following graph is a continuous function? a. b. C. d