Page 29 - Bimbingan Revisi Produk E-modul 3
P. 29
Contoh Soal
Bola pejal bermassa 1 kg dilempar vertikal ke atas dari tanah dengan kecepatan awal 40 m/s. Jika
2
percepatan gravitasi di tempat itu adalah 10 m/s , maka besar energi kinetik bola saat bola mencapai
ketinggian 20 meter adalah...
Penyelesaian:
Diketahui:
2
m: 1 kg, h 1: 0, v 1: 40 m/s, g: 10 m/s , h 2: 20 m
Ditanya: Ek 2
1 = 2
1 + 1 = 2 + 2
1 2 1 2
m. v + h 1 = m. v + h 2
1
2
2 2
1 . 1. 40 + 1.10.0 = Ek + 1.10.20
2
2 2
800 = Ek + 200
2
Ek = 800 − 200
2
Ek = 600 Joule
2
Kesimpulan
Buatlah kesimpulan apa yang telah Anda pelejari mengenai materi pada kegiatan belajar 2!
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