A=Eп
A=F*l/2=kl²/2
Eп=mgh
k*l²/2=mgh
k=(2*m*g*10)/l²=(2*0,01*6,4*10)/0,04²=800 H/м
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A=Eп
A=F*l/2=kl²/2
Eп=mgh
k*l²/2=mgh
k=(2*m*g*10)/l²=(2*0,01*6,4*10)/0,04²=800 H/м