Jawabanmu

2014-04-04T19:43:21+07:00
EK = 1/2 . m . v²
EK = 1/2 . 0,020 . 400²
EK =  0,020 . 1600
EK = 1/2 . 32 
EK = 16 joule

2014-04-04T19:46:21+07:00
Ek = 1/2 m . V^2 = 0,01 . 160000 = 1600