1. The problem statement, all variables and given/known data A 0.5 kg tennis ball is dropped from rest at a height of 5.6 m onto a hard floor. 2. Relevant equations a) What is the speed of the ball at the instant of contact with the floor? v = m/s 3. The attempt at a solution I need acceleration and I have attempted using the equation: v^2 = u^2 +2as to solve for a. I set the variables as follows: v = 0 u = 9.81 s = 5.6 I got a = 8.6 as my answer. I either have the wrong equation or I am making a mistake on how I set it up. I know this is a one-dimension kinematic problem but I have been having trouble setting these up, any help in the right direction is much appreciated!