I am not good at typing out formulas and equations on the internet, so I took pictures of what I did instead. I hope that's not too informal. 1. The problem statement, all variables and given/known data A rock is tossed straight up with a velocity of 19 m/s. When it returns it fell into a 10 m deep hole. Q: What is the rock's velocity as it hits the bottom of the hole? 2. Relevant equations 3. The attempt at a solution So in the end I figure out that I am suppose to plug 19 m/s as my initial velocity, but I don't get why. If the rock is tossed straight up should it not means that the initial velocity = 0 because initially the rock is at rest?