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m = 60 kg
Ek = 1,2x10⁴ J
dit : v ?
dijawab :
Ek = 1/2 x m x v²
1,2x10⁴ = 1/2 x 60 x v²
1,2x10⁴ = 30 x v²
v² = 1,2x10⁴/30
v = √400
v = 20 m/s
jadi kecepatan = 20 m/s