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**1. Homework Statement**

On an alien planet you throw a stone upward and measure the times Ta and Tb. The difference in heights of point a and point b is h. Calculate the acceleration due to gravity.

Ta = 7.1s; Tb= 4.4s; h = 15.1m

**2. Homework Equations**

a = dv/st

v(t) = vo - gt

**3. The Attempt at a Solution**

I have tried solving a = t*(2gh)^.5. I have also tried a = 2h/(Ta-Tb). I keep getting numbers that are far too great I believe based off of the numbers I am given.