If a steel ball is tossed from the top of the Berj Khalifa in Dubai, the tallest building in the world, its height above the groundtseconds after it is dropped will bes(t) = 271716t²

feet (neglecting air resistance).

(a) How long will it take to reach the ground? [Hint: Find when the height equals zero.] (Round your answer to two decimal places.)

13.03s

(b) Use your answer to part (a) to find the velocity with which it will strike the ground. (This is called theimpact velocity. Round your answer to two decimal places.)

?ft/s