Introduction Physics: Free Fall problem

[Ashford]

Homework Statement

Divers in Acapulco, Mexico, leap from a point 36 m above the sea. What is their velocity when they enter the water?

Homework Equations

V^2=u^2+2as, probably wrong.

The Attempt at a Solution

s=36, u= 0, Find Final Velocity, a= -9.8 , I get some ridiculous number. Don't know how to start the problem.

 

[bel]

If the acceleration vector is taken as negative, so too shall the displacement vector, thus you would not have any imaginary number.