math
posted by Alex on .
an object is launched from ground level with an initial velocity of 400 feet per second. To the nearest tenth off a second, how long does it take the object to reach a height off 650 feet?

h = Vo*t + 0.5g*t^2 = 650 Ft,
400t + 16t^2 = 650,
16t^2 + 400t 650 = 0,
Use Quadratic Formula to find t:
t = 1.53s.