Finding g given height & time

[ccsmarty]

Calculating "g" given height & time

This problem is part of a physics lab. I need this step to finish the other parts of the lab, and I can't figure out how to do this step.

Homework Statement

Using the best estimate and uncertainty for the fall time, calculate the value of "g" with the appropriate number of significant figures.

fall time = 0.4249 +/- 0.0001 seconds
height = 1.002 +/- 0.005 meters

Homework Equations

acceleration = height/(time)^2 (?)

The Attempt at a Solution

I'm not even sure where to start...

 

[learningphysics]

Use the formula

d = v1*t + (1/2)at^2

apply this formula to this situation...

 

[HallsofIvy]

Since in this problem, the object is "falling" (i.e. not thrown up or down), v1= 0. Put in the given values for d and t and you have a single equation to solve for a (for gravity problems, a= v).

 

[ccsmarty]

Thanks to both of you for your help :)