How does the force required to lift an object in water compare to the force needed to lift the same object on land?

it is the exactly the same for the same object.
it can be either greater or less, depending on the object.
it is more.
it is less.

What is the relationship between the wavelength of a wave and it's energy?

The slope of a velocity time graph over any interval of time gives the during that interval

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?