# Calculating Final Velocity

by maca_404
Tags: final, velocity
 P: 7 Question is a golf ball is dropped from a height of 78m assuming gravity is 9.8 m s, What is the velocity of the ball after the first 10m. I assume the equation to use is $$v^2=u^2+2ax$$ v = Final velocity u = Initial Velocity a = Acceleration x = Displacement So I plug in $$v^2 = 0+2(9.8ms)(10.0)$$ Now according to the answer sheet V should be 14.0 m s but no matter how I plug this in I cant seem to get the right answer. I think the problem is the way I am actually doing the math so if someone could perhaps step threw the maths so I can see where I went wrong. Thanks for any help 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution