If a 100-kg mass suspended from a wire stretches it by 6. 20 mm, with a uniform cross-sectional area of 0. 150 cm² and an unstretched length of 4. 35 m, what is the value of stress in the wire?
a) 2. 42 × 10⁷ N/m²
b) 4. 84 × 10⁷ N/m²
c) 1. 21 × 10⁷ N/m²
d) 3. 63 × 10⁷ N/m²