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Ek = 128 J
v = 8 m/s
Ditanyakan : m . . ?
Penyelesaian :
Ek = 1/2 m v²
128 = 1/2 x m x 8²
128 = 1/2 x m x 64
128 = 32 x m
m = 128 / 32
m = 4 kg