A diver springs upward with an initial speed of 1.8m/s from a 3.0-m board.
  1. Find the velocity with which he strikes the water.
    [Hint: When the diver reaches the water, his displacement is y=-3.0 m (measured from the board), assuming that the downward direction is chosen as the negative direction.]
  2. What is the highest point he reaches above the water?