1. The problem statement, all variables and given/known data Gr.11 Physics, about 2 months in so I don't know much. Bob pitches his calculator in to the air and watches it rise to a height of 5 meters above the floor, and rebound to a height of 4 meters. The calculator was in contact with the floor for ten milliseconds, and it has a mass of 500 grams. Calculate the upward force exerted on the calculator by the floor. 2. Relevant equations Here's all the equations I think would be relevant?: Fn = Fg Fg = mg Ff = uFn Fnet = ma 3. The attempt at a solution I'm not entirely sure where to start with such little info. I tried to get the Force of Gravity (Fg) like this: Fg = mg = (0.5kg)(9.8) = 4.9N But I feel like the fact that it was accelerating towards the ground would increase that? Any help is appreciated.