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◾ Materi : Usaha dan Energi◾ Sub materi : Usaha
◾ Mapel : Fisika
Diketahui :
m = 2 kg
Vo = 2 m/s
Vt = 4 m/s
t = 10 sekon
Ditanya :
W = ?
Penyelesaian :
*Cari percepatan benda
Vt = Vo + at
4 = 2 + a(10)
2 = a(10)
a = 0,2 m/s²
*Cari jarak tempuh benda
Vt² = Vo² + 2as
4² = 2² + 2(0,2)s
16 = 4 + 0,4s
12 = 0,4s
s = 30meter
*Cari usaha benda
W = Fs
W = (m. a) s
W = (2. 0,2)30
W = (0,4)30
W = 12 Joule
Jadi, usaha yg dilakukan benda adalah 12 Joule
Jawaban : A
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