- #1

sprinter08

- 19

- 0

## Homework Statement

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?

## Homework Equations

delta y = Vot + 1/2at^2

## 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.