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m = 4 kg
a = 2 m/s2
g = 10 m/s2
ΣF = m x a
w - F = m x a
F = w + (m x a)
F = (m x g) + (m x a)
F = m (g + a)
F = 4 (10 + 2)
F = 4 x 12
F = 48 N
Δx = F/k = 48/400 = 0,12 m
jadi pertambahan panjangnya 0,12 m