Having trouble with this problem: 3. [SFHS99 5.P.37.] A 50.0 kg diver steps off a 12.0 m high diving board and drops straight down into the water. If the diver comes to rest 5.0 m below the surface of the water, determine the average resistance force exerted on the diver by the water. Seems to me like a simple kinematic problem, so I used kinematic equations to find the Vf when it hits the water (15.32m/s), then used that as a new Vi to find the time it took to decelerate from Vi to 0 in 5 meters. (.653 sec) I then used that time to find a (de)acceleration rate for the diver, for which I got (-)23.46 m/s^2. I then simple multiplied that by the diver's weight to get a resistence force, which was (-)1173 N. However, my online homework is telling me this is wrong! Any tips?