Bubba drops a small pebble down a well shaft one day to see how deep it is. He notices that it takes the pebble 2.76 seconds to reach the bottom of the well. Bubba then throws a pebble down the same well so that it reaches the bottom of the well in 1.54 seconds. How fast did bubba throw the pebble down the well? How fast is the pebble moving that bubba threw down the well when it hits the bottom of the well?