A rescuer on a helicopter that is 50 feet above the sea drops a lifebelt. the distance from the lifebelt to the sea can be modeled by the equation h(t)= -16^2+s, where t is the time, in seconds, after the lifebelt is dropped, and s is the initial height, in feet, of the lifebelt above the sea. How long will it take for the life belt to reach the sea? Round your answer to the nearest tenth of a second.