Tolong diisi yaa sebisa bisanya ajaa.

KM = W / F = s / h
KM = 15 m / (2,25 m) = 20/3 ≈ 6,67

F = mgh / s
   = (20 kg)(10 m/s²)(2,25 m) / (15 m) = 30 N

W = Fs
    = (30 N)(15 m) = 450 J

keuntungan mekanis
KM = S / h
KM = 15 / 2,25
KM = 20/3 = 6⅔

gaya kuasa
F = w / KM
F = mg / KM
F = 20•10 / (20/3)
F = 30 N

usaha
W = F S
W = 30 • 15 = 450 J
atau
W = w h = m g h
W = 20 • 10 • 2,25 = 450 J