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v = 2 m/s
Ek = 400 J
Ditanya: m.....?
jawab:
Ek = 1/2 m v²
400 = 1/2 x m x 2²
400 = 1/2 x 4 x m
400 = 2m
m = 400/2
m = 200 kg
massa benda 200 kg