If an object is propelled upward from a height of s feet at an initial velocity of v feet per second, the n it's height h after t seconds is given by the equation h=-16t^2+vt+s, where h is in feet. If the object is propelled from a height of 8 feet with an initial velocity of 96 feet per second, its height h is given by equation h=-16t^2+96t+8 After how many seconds is the height 148 feet? The time is ___ seconds