Hi This seems like a helpful community so I thought I could ask you guys for some help. First of all I need to clarify that English is not my first language so you'll have to excuse me if I make any grammatical or spelling errors. Ok, here's my question: I'm am trying to calculate the kinetic energy of a person who is standing on a diving board 8 meters above the surface. He weighs 80kgs. What is his kinetic energy after falling 2m ? I think it's 1/2*80*9,8^2 = 3841,6 joule But the textbook tells me I have the wrong answer I also have to find out his velocity as he reaches the surface, and I have no clue where to even begin. Any help would be appreciated, thank you.