(adsbygoogle = window.adsbygoogle || []).push({}); 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.

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# Homework Help: Helicopter and package

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