With what velocity does the diver hit the water

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To determine the velocity at which a 70kg diver hits the water from a 12m tower, the diver's potential energy is converted to kinetic energy. For part a, using the formula for gravitational potential energy and kinetic energy, the impact velocity can be calculated. For part b, if the diver has an initial upward velocity of 5.0 m/s, this initial velocity must be factored into the total energy calculations. The discussion emphasizes understanding energy conservation principles to solve the problem effectively. Clarification on the energy equations is sought to aid in the calculations.
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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!
 
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For part a, maybe try thinking about the divers energy.

What are the expressions you listed?
 

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