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Homework Statement
A stone of mass 0.2kg is dropped from the top of a building 80m high. After t seconds it has fallen x meters and has a velocity of v. What is the potential energy of the stone t seconds later
Homework Equations
The answer is 2(80 - x) = 160 - 10t^2
Using suvat: s = ut + (1/2)at^2
The Attempt at a Solution
I started with PE = mgh
PE = 0.2 * 10 * h
PE = 2h
Then I figured h = (1/2)*10*t^2
or h = 5t^2
So now I have
PE = 10t^2
Not sure if I'm headed in the right direction or not.