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v = 3m/s
energi kinetik = m.v pangkat 2 :2
= 800.3 pangkat 2 : 2
= 800.9 : 2 = 3600 J
800 =m.10
m= 800/10
m= 80
EK = 1/2 . m . v^2
EK = 1/2 . 80 . 3^2
EK= 360 J