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S=x+y=x+v(r2-x2)
Ds/dx=1+(-2x)/2v(r2-x2) put ds/sx=0 , we get
1-x/v(r2-x2)=0
ð X=r/v2
ð D2s/dx2=0- { v(r2-x2).1+x2/v(r2-x2)}
ð D2/dx2=-r2/v(r2-x2)
Pur x=r/v2, we get
Y=v(r2-x2)
=v(r2-r2/2
=vr2/2
=r/v2
So x=y=r/v2
Thanks & regards
Rinkoo Gupta
askIITians faculty
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