posted by Chasity .
A helicopter is ascending vertically with a speed of 4.50 m/s. At a height of 195 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the helicopter's.]
hf=0=hi+vi*t+1/2 g t^2
solve this squadratic equation for t