a ball is thrown down ward from a 320 ft building at a initial velocity of 32 ft per sec. How long would the ball take to reach a height of 48 feet?'
16t^2+32+320
so, just fix the typo and solve
-16t^2-32t+320 = 48
t = 3.24
16t^2+32+320
-16t^2-32t+320 = 48
t = 3.24