A volcano shoots out blobs of molten lava, called lava bombs, from its summit. A geologist observing the eruption uses a stopwatch to time the flight of a particular lava bomb that is projected straight upward. If the time for the bomb to rise and fall back to its launch height is 4.75 s, and its acceleration is 9.8 m/s2 downward, what is its initial speed? (4 steps)