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MOMENTUM
• HKM

p = perahu, a = anak

vpa = 5 m/s
mp = 60 kg, vp' = __?
ma = 40 kg, va' = -40 m/s

HKM
Σp = Σp'
(mp + ma) • vpa = mp • vp' + ma • va'
(60+40) • 5 = 60 • vp' + 40 • (-10)
500 = 60 vp' - 400
900 = 60 vp'
vp' = 15 m/s ← jwb
(searah gerak perahu semula)