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Ek B1 = 1/2 m 20² = 200m J
Ek B2 = 1/2 2m 10² = 100m J
B1 : B2 = 200 : 100 = 2 : 1
Ek1 = 1/2 . x . (10 m/s)^2
= 50
Ek2 = 1/2 . 2x . (20 m/s)^2
= 400
Ek1 : Ek2 = 50 : 400
= 1 : 8