Mohon bantuannya ya

<p>a. Energi mekanik = E_Potensial + E_Kinektik</p><p>(1) Energi mekanik₁ = Energi mekanik₂&nbsp;</p><p>(2) Karena bola sudah mencapai tanah, energi potensial tidak dihitung karena ketinggian (h) = 0 meter</p><p>m = 2 kg</p><p>v = 20 m/s</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; E_Kinektik = ½ m.v²</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= ½ 2.20²</p><p>^{&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;}E_Kinektik= <strong>400 Joule</strong></p><p>&nbsp;</p><p>b. Ketinggian gedung bertingkat:</p><p>V² = 2.g.h</p><p>20²= 2.10.h</p><p>400 = 20.h</p><p>h = 400/20&nbsp;</p><p><strong>h = 20 meter</strong></p><p>&nbsp;</p><p>Semoga membantu ☺&nbsp;</p>