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Verified answer
Diket :m = 60kg
h = 6 m
g = 10 m/s
E.K = m.g.h = 60.6.10 = 3600 joule (saat menyentuh air)
Di antra papan dan air = h/2 = 6/2 = 3m
E.K = m.g.h = 60.3.10 = 1800 joule(diantara papan dan air)