1. The problem statement, all variables and given/known data A helicopter is ascending vertically with a speed of 5.5m/s. At a height of 100m above the Earth, a package is dropped from a window. How much time does it take the package to reach the ground? 2. Relevant equations delta y = Vot + 1/2at^2 3. The attempt at a solution well I know that: Vo= 5.5m/s a=-9.8 m/s^2 delta y= -100m I re-wrote the equation so that I would solve it using the the quadratic formula. -5.5 + the square root of (5.5)^2 -4(-4.9)(100)/ 2(-4.9) My teacher gave us the answer of t= 5.11s, but I can't figure out how he did it.