Resposta :
[tex]E_{m}^{(final)}=E_{m}^{(inicial)}[/tex]
[tex]E_{c}^{(final)}+E_{pg}^{(final)}=E_{c}^{(inicial)}+E_{pg}^{(inicial)}[/tex]
[tex](E_{c}^{(inicial)}+150) + 0 = 0 + (m*g*h)[/tex]
[tex](0+150)=m*g*h[/tex]
[tex]m*g*h=150[/tex]
[tex]2*10*h=150[/tex]
[tex]20*h=150[/tex]
[tex]h=150/20[/tex]
[tex]h=7,5m[/tex]
[tex]E_{c}^{(final)}+E_{pg}^{(final)}=E_{c}^{(inicial)}+E_{pg}^{(inicial)}[/tex]
[tex](E_{c}^{(inicial)}+150) + 0 = 0 + (m*g*h)[/tex]
[tex](0+150)=m*g*h[/tex]
[tex]m*g*h=150[/tex]
[tex]2*10*h=150[/tex]
[tex]20*h=150[/tex]
[tex]h=150/20[/tex]
[tex]h=7,5m[/tex]