If an object is propelled upward from a height of s feet at an initial velocity of v feet per second, then its height h after t seconds is given by the equation h= -16^2+vt+s, where h is in feet. if the object is propelled from a height of 12 feet with an initial velocity of 96 feet per second its height h is given by the equation h= -16t^2 +96t+12. after how many seconds is the height 120 feet?