maka diketahui: m = 2kg ek = 400 j ditanya : v2 =........m/s

Ek = 1/2 mv²
400 = 1/2 × 2 × v²
v² = 400 m/s

Ek =1/2 x m x v^2 400 J =1/2 x 4 x v^2 400 J =2 x v^2 v^2 =400 : 2 v^2 =200 m/s^2