A person standing near the ege of a cliff 100 feet above a lake throws a rock upward with an inital speed of 32 feet per second. The height of the rock above the lake at the bottom of the cliff is a function of time and describe by \large h\left(x ight)=-16t^2+32t+100, where t is time in seconds and h(t) is the height of the rock in feet. How many seconds will it take until the rock reaches its maximum height