With what velocity does the diver hit the water

[kelly242]

Homework Statement

A 70kg diver jumps from a 12 m tower, with no initial velocity.
a)With what velocity does the diver hit the water
b)What would his impact velocity be if, in jumping from the tower, he gave himself a upward initial velocity of 5.0 m/s ?

Homework Equations

W=FaDcos of theta
W= Ep+Ek+Frd

The Attempt at a Solution

this doesn;t make any sense to me. please help!

 

[TobeHode]

For part a, maybe try thinking about the divers energy.

What are the expressions you listed?