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g=10m/s∧2
x=50cm=0.5m
Dit : k
k=F/x
= m.g/x
= 1.10/0.5
=10/0.5
= 20N/m
1/2mv²=1/2ky²
1(10)²= k(0,5)²
100=1/4 k
k= 400N/m
klw menurut saya yg benar caranya seperti ini.