A man weighs 60 kgf on Earth. His weight in newtons is:
A588 N
B60 N
C600 N
D60000 N
Answer & Solution
Correct answer: A. 588 N
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)_
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