A ball is thrown upward and has height function h(t) = -9t2 + 54t, t > 0 where s is in meters and t is in seconds. Record your answer to each question in the corresponding answer box. Input numbers only (and negative sign if needed), do not input the units. 1. Find its velocity after 2 seconds. 2. Find its acceleration after 2 seconds. 3. Find the maximum height reached by the ball. 4. With what velocity will it hit the ground.