When an object is dropped straight down, the distance (in feet) that it travels in t seconds is given by s(t) = - 16t2. Find the velocity at each of the following times. a. After 3 seconds. b. After 5 seconds. c. After 9 seconds. d. Find the acceleration. E) a. The velocity after 3 seconds is D ft/sec. b. The velocity after 5 seconds is D ft/sec. c. The velocity after 9 seconds is D ft/sec. d. The acceleration is D ft/secz