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[tex]\displaystyle 2\\m=2\,\text{kg}\\h=120\,\text{m}\\\\h_B=?\\\\E_m=E_m\\E_{p_B}+E_{k_B}=E_{p_A}\\E_{p_B}+3E_{p_B}=E_{p_A}\\4mgh_B=mgh\\4h_B=h\\4h_B=120\\\boxed{\boxed{h_B=30\,\text{m}}}[/tex]

[tex]\displaystyle 3\\\text{cari koordinat titik berat masing - masing bangunan}\\\\x_\square=\frac12p\wedge y_\square=\frac12l\\x_\square=\frac12(8)\wedge y_\square=\frac12(10)\\x_\square=4\wedge y_\square=5\\\\x_\Delta=\frac12a\wedge y_\Delta=10+\frac12t\\x_\Delta=\frac12(8)\wedge y_\Delta=10+\frac12(9)\\x_\square=4\wedge y_\square=14,5\\\\s=y_\Delta-y_\square\\s=14,5-5\\\boxed{\boxed{s=9,5}}[/tex]