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200gr=0,2kg
25cm=0,25m
delta x=0,25m-0,2m=0,05m=5x10^-2
F=m.g
F=0,2.10
F=2N
F=k.delta x
=k.5x10^-2
2=k.5x10^-2
k=2/5x10^-2
k=200/5
k=40
Ep=1/2.k.delta x^2
=1/2.40.(5x10^-2)^2
=20.25x10^-4
=500x10^-4
=0,05J
Jawabannya B.