Could someone please show me how to solve these Difficult Physics Problems?

[Theoden K]

Any help would be greatly appreciated.

1. To enter the main pool at an amusement part, a swimmer uses a water slide which has a vertical height of 2.89 m. Find her speed at the bottom of the slide if she starts with an initial speed of 0.990 m/s.
m/s

2, A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 26 m high. When it hits the ground at the base of the cliff the rock has a speed of 30 m/s.
(a) Assuming that air resistance can be ignored, find the initial speed of the rock.
m/s
(b) Find the greatest height of the rock as measured from the base of the cliff.
m

3. Catching a wave, a 65 kg surfer starts with a speed of 1.3 m/s, drops through a height of 2.00 m, and ends with a speed of 8.2 m/s. How much nonconservative work was done on the surfer?
kJ

Thank you again for any positive help.