9. You are sitting down by the beach on a summer evening and see a piece of wood bobbing up and down in the water. How long does it take for the piece of wood to move from its bottom position to its top position during its up and down motion as the waves pass? You know that waves travel at a speed of 1.2 m/s and have a wavelength of 0.60 m. please answer in word prg please thx..