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F = w = m . g
= 2 . 10
= 20 N
Mencari konstanta pegas
F = k . x
k = F / x
k = 20 / 0,4 m
k = 50 N/m
Energi potensial
= 1/2 . k . x^2
= 1/2 . 50 . 0,4^2
= 25 , 0,16
= 4 J