sebuah benda massanya 5 kg hendak dijatuhkan dari ketinggian 3 m di atas permukaan tanah , bila percepatan gravitasi bumi 10 m/ s '2 tentukan : a. energi potensial dan energi kinetik saat hendak dijatuhkan b. energi potensial dan energi kinetik saat berada pada ketinggian 2 m di atas permukaan tanah

<p>a. Energi potensial dan energi kinetik saat hendak dijatuhkan</p><p>&nbsp; &nbsp; &nbsp;m = 5 kg</p><p>&nbsp; &nbsp; &nbsp;h = 3 m</p><p>&nbsp; &nbsp; &nbsp;g = 10 m/s²</p><p>&nbsp; &nbsp; Saat benda hendak dijatuhkan maka Ek = 0 karena benda belum&nbsp;</p><p>&nbsp; &nbsp; bergerak.</p><p>&nbsp; &nbsp; Ep = m x g x h</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 5 x 10 x 3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = <strong>150 Joule</strong></p><p>&nbsp; &nbsp; Em = Ep + Ek</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 150 + 0</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 150 Joule</p><p>&nbsp;</p><p>b. Energi potensial dan energi kinetik saat berada pada ketinggian 2 m di &nbsp; &nbsp; &nbsp; &nbsp;atas permukaan tanah</p><p>&nbsp; &nbsp; &nbsp;m = 5 kg</p><p>&nbsp; &nbsp; &nbsp;h = 2 m</p><p>&nbsp; &nbsp; &nbsp;g = 10 m/s²</p><p>&nbsp; &nbsp; &nbsp; Ep = m x g x h</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 5 x 10 x 2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = <strong>100 Joule</strong></p><p>&nbsp; &nbsp; &nbsp;Em = Ep + Ek</p><p>&nbsp; &nbsp; &nbsp;150 = 100 + Ek</p><p>&nbsp; &nbsp; &nbsp; Ek = 150 - 100</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = <strong>50 Joule</strong></p><p>&nbsp; &nbsp; &nbsp;</p><p>&nbsp;</p><p>Keterangan :</p><ul><li>Em = Energi mekanik. Energi mekanik benda dimanapun kedudukannya adalah sama</li><li>Ep = Energi potensial</li><li>Ek = Energi Kinetik</li></ul>