Jawabanmu

2014-03-04T18:54:06+07:00
1/2 × 0,5 kg × (20 m/s)²
1/2 × 0,5 kg × 400 m/s²
1/2 × 200
100 J
2014-03-04T19:16:23+07:00
Ek = 1/2 x m x v2
ek = 1/2 x 6 g x 20 x 20
ek = 1/2 x 0,6 kg x 20 x 20
ek = 120 j