A man weighs 60 kgf on Earth. His weight in newtons is:

1. One kilogram-force equals the gravitational force on 1 kg at Earth's surface. 2. So 1 kgf = 1 kg × g, where g ≈ 9.8 m per second squared. 3. 1 kgf ≈ 9.8 N. 4. Therefore 60 kgf ≈ 60 × 9.8 = 588 N. 5. Option C uses g = 10 m per second squared, an approximation. 6. The textbook-precise value is 588 N. _Source: Selina Concise Physics ICSE Class 9, Ch 3 'Laws of Motion' (aplustopper.com extract)_