When the load on a wire is slowly increased from 3 to 5 kg wt, the elongation increases from 0.61 to 1.02 mm. The work done during the extension of wire is

Work done =12 ×stretching force ×extension.Therefore, net work done in increasing the length from 0.61 mm to 1.02 mm isW2−W1=12×5×9.8×1.02×10−3−12×3×9.8×0.61×10−3=0.016J