hello!!
since we know that,
stress=f/a,
here f=mg,and
also we know that,d=m/v ; v=m/d
if we divide v=m/d with 'l'on both sides we get, v/l=m/dl;
since,v=l^3
we have ,
l^2=m/d*l;
we get area by m/d*l;
now apply this on stress=f/a.
thank you,hope this helps you!!
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