In volleyball, after an underhand serve, the ball goes up and over the net reaching its maximum point, and then slopes downward back at the ground. This is a parabola. If the server hits the ball from directly behind the net (0,0), the net is 10ft high, and the ball goes 10ft across the court, then what is the equation?
Equation : y = 0.5(x-10)^2+5