Projectile Motion: Finding Final Vertical Velocity

[warguy701]

Homework Statement

A backpacker throws a rock horizontally off of a cliff with an initial velocity of 11.7 m/s, and the rock lands 17.3 m away from the base of the cliff. What is the final vertical velocity of the rock? Round your answer to 2 decimal places.

Homework Equations

Δd = vot + 1/2at2

vf = vo + at

vf^2 = vo^2 + 2aΔd

The Attempt at a Solution

18.9 m/s

 

[Integral]

You need to show how you got that 18.9 m/s answer. Hint you can find the time of flight easily.