help on this problem?!?
A diver is standing on a platform 24 ft. above the pool. He jumps from the platform with an initial upward velocity of 8ft/s. Use the formula h(t) = -16t^2 + vt + s, where h is his height above the water, t is the time, and v is his starting upward velocity, and s is his starting height. How long will it take for him to hit the water?