Jawabanmu

2014-02-23T20:33:55+07:00
1/2.m.k kuadrat
1/2.40 kg.100 m2/s2
20 kg.100m2/s2
2000 J

semoga bermanfaat
2014-02-23T20:33:59+07:00
Ek = 1/2 . 40 . (10)²
        1/2 . 40. 100
         2000