Asteel bar 100 mm long and having a square cross section of 20 mm on an edge is pulled in tension with a variable load similar to a tensile test. if the bar started its plastic deformation when the load was 90 n, at which the bar elongated 1 mm. in addition, the bar started necking at 200n, at which the elongation was measured to be 3 mm. calculate the following mechanical parameters: a)- yield strength b)-young's modulus of elasticity c)-engineering tensile strength d)-strain-hardening coefficientstrength coefficient