1/2·k·x^2 = m·g·h---> h = k·x^2/(2·g·m)
k = 20 N/m
x = 0.2 m
g = 9.806 m/s^2
m = 0.025 kg
h = 20·0.2^2/(2·9.806·0.025)---> h = 1.63 m circa
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