mohon bantuannya nomor 5

Materi Simple Machine

Diketahui
m = 80 kg
g = 10 m/s^2
w = mg = 80 × 10 = 800 N
L = 120 cm
F = 200 N

Jawaban A
[tex] \displaystyle KM = \frac{w}{F} = \frac{800N}{200N} = 4 [/tex]

Jawaban B
Misalkan Lk = x cm, maka Lb = (120 - x) cm.
Pada tuas, berlaku
[tex] Lk \times F = Lb \times w \\ x \times 200 = (120 - x) \times 800 \\ x = 4(120-x) \\ x = 480 - 4x \\ 5x = 480 \\ x = 96 [/tex]
Jadi,
Lk = 96 cm
Lb = 120 - 96 = 24 cm