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Iqra'
Ketika lima bola diam, masing-masing memiliki energi potensial nol karena mereka tidak bisa bergerak turun setiap energi kinetik lebih lanjut dan nol karena mereka tidak bergerak. Ketika bola pertama diangkat dan keluar, energi kinetik tetap nol, tetapi energi potensialnya lebih besar, karena gravitasi bisa membuatnya jatuh. Setelah bola dilepaskan, energi potensialnya diubah menjadi energi kinetik saat kejatuhannya karena gravitasi bekerja tidak di atasnya. Ketika bola telah mencapai titik ter...
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