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Ek_ab : Ek_bc
= ½ m vab² : ½ m vbc²
= vab² : vbc²
= 20² : 40²
= 1² : 2²
= 1 : 4 ← jwb
9][ Pesawat sederhana: tuas
wt Lt = wi Li
500 Lt = 200 • 2
Lt = 0,8 m ← jwb
10][ Gelombang
v = S / t
v = (120 cm) / 0,2 s)
v = 600 cm/s = 6 m/s ← jwb
11][ Bunyi
S = v t/2
S = 1500 • 2/2
S = 1500 m ← jwb