Ответы на вопрос:
A=a1-a2=[ k(x1+x2)^2/2 ] - [kx1^2/2]=[30*(0.02+0.04)^2/2] - [30*0.02^2/2]= 0.048[дж] a1=k(x1+x2)^2/2 a2=kx1^2/2
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