Final answer:
To determine the elongation of rod ab, calculate the tensile stress and use Young's modulus to find the elongation.
Step-by-step explanation:
To determine the elongation of rod ab, we need to calculate the tensile stress in the rod and use Young's modulus to find the elongation. First, calculate the tensile stress using the formula:
Tensile Stress = Force/Area
Next, use Young's modulus:
Elongation = (Tensile Stress/Young's Modulus) x Original Length
Substitute the values and solve to find the elongation of rod ab.