Question

If (on earth) an object falls 18m and loses 36J of GPE. What is the objects mass?

Answer 1

PE=mgh
Where 'g' is the gravitational constant (9.81 m/s^2)
If you're solving for m, you can change the equation to be (PE/gh)=m.
m=(36J/18m*9.81m/s^2)
m=.2kg