ANSWER:
STEP-BY-STEP EXPLANATION:
We calculate the potential energy in each case as a function of gravity and then organize.
Just like that:
[tex]\begin{gathered} E_{P1}=15\cdot3\cdot g=45\text{ }g \\ \\ E_{P2}=10\cdot9\cdot g=90\text{ }g \\ \\ E_{P3}=1\cdot20\cdot g=20\text{ }g \\ \\ E_{P4}=2\cdot25\cdot g=50\text{ }g \end{gathered}[/tex]
Now we organize:
