Jawabanmu

2014-02-10T16:17:37+07:00
M = 2 kg
g = 10 m/s²
x = 25 cm - 20 cm
   = 0.25 - 0.20 = 0.05 cm

Jawab:
F = m×g
   = 2×10 = 20 N
K = F ÷ x
    = 20 ÷ 0.05 = 400 N/m