A lava bomb is a missile composed of cooling, practicallysolid lava. You are a geologist, watching a volcano launch a lava bomb straight upward. According to your stopwatch, it takes exactly 15.0 seconds for the lava to fall back to its initial point. Assuming no air drag:
(A) What is the Initial Speed at which the lava bomb got launched?
(B) What is the maximum height reached by the lava bomb, above the volcano?
(C) How long after initial launch does the lava bomb's acceleration go to zero?
(D) What is the final speed at which the lava bomb hits the volcano on its way down?