physics
posted by Anonymous .
a projectile is launched straight up with an initial velocity of 112 feet per second. how long would it take to reach 180 feet?

d = Vo*t + 0.5g*t^2 = 180,
112t  16t^2  180 = 0,
Divide both sides by 4:
28t  4t^2  45 = 0,
4t^2 + 28t  45 = 0.
X = 2.5s. Use Quadratic Formula and use
the smaller of the 2 solutions.