Jawabanmu

2014-05-20T18:36:55+07:00
Ek = 1/2 . m. v^2
128 = 1/2 . m. 8^2
128 = 1/2 . m. 64
128 = 32 m
4 kg = massa
1 4 1
2014-05-20T19:03:59+07:00
EK = 1/2 x m x v²
128= 1/2 x m x (8m/s)²
128 = 1/2 x m x 64 m²/s²
128= m x 32 m²/s²
128 : 64 = m
2 = m
m = 2 kg
1 5 1