The function s = f(t) gives the position of a body moving on a coordinate line, with s in meters and t in seconds. Find the body's speed and acceleration at the end of the time interval. s = 9t - t^2, 0 lessthanorequalto t lessthanorequalto 9 A. 27 m/sec, - 18 m/sec^2 B. 9 m/sec, 18 m/sec^2 C. 0m/sec, -2 m/sec^2 D. -9 m/sec - 2 m/sec^2