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◾ Materi : Usaha dan Energi◾ Sub materi : Usaha
◾ Mapel : Fisika
◾ Keyword : Usaha, Kerja
Diketahui :
m = 3 kg
F = 15 N
t = 1 menit = 60 sekon
Ditanya :
W = ?
Penyelesaian :
*Cari percepatan benda
F = ma
15 = 3a
a = 5 m/s²
*Cari jarak tempuh benda
s = Vot + ½at²
s = 0(60) + ½(5)(60)²
s = 9000 meter
*Cari usaha benda
W = Fs
W = (15)(9000)
W = 135.000 J
W = 135 kJ
Jadi, usaha yg dilakukan benda tsb adalah 135 kJ
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-vin