Jawabanmu

2014-02-28T06:53:30+07:00
Dik : m = 4kg
        v = 4 m/s
Dit : Ek =...?
Penyelesaian :

Ek = 1/2 × m × v²
Ek = 1/2 x 4 kg x (4m/s)²
Ek = 2 kg x 16 m²/s²
Ek = 32 joule



A. 48 J, b. 64 J, c. 72 J, d. 128 J, e. 144 J
2014-02-28T10:52:50+07:00
Vt= Vo + a.t = 0 + 4. 2 = 8 m/s Ek= 1/2 .m.v^2 = 1/2 . 4. 8^2 = 128 J