Very very urgent please solve quickly.
a = 10 , b = 7
Extracted text: A bar made of a metal alloy has the dimensions shown in Figure. If an axial force of P=10xb kN is applied to the bar, determine the change in its length and the change in the dimensions of its cross section after applying the load. The material behaves elastically. (E = 210 GPa; v= 0.32) P 10xbkN 10xa mm 0,3ха m P 10xbkN 20ха mm