GKFix MCQ Question

A steel wire 0.72 m long has a mass of 5.0×10⁻³ kg. What is its linear mass density?

• A. 7.2×10⁻³ kg/m
• B. 6.9×10⁻³ kg/m
• C. 5.0×10⁻³ kg/m
• D. 8.1×10⁻³ kg/m