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m = 5x10^3
Ek = 1x10^6 J
Ditanya: v...?
Ek = 1/2.m.v^2
v^2 = 2.Ek/m
v^2 = 2.1x10^6/5x10^3
v^2 = 2x10^6/5x10^3
v^2 = 0,4x10^3
v^2 = 4x10^2
v = 20 m/s (B)