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ma = mb = m
va = 20 m/s
vb = 30 m/s
Eka : Ekb = __?
Energi kinetik
Ek = ½ m v²
perbandingan
Eka : Ekb
= ½ m va² : ½ m vb²
= va² : vb²
= 20² : 30²
= 4 : 9 ← jwb