The mass of a body is 5kg. Express its weight in
i) kg f and ii) N

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Solution

The mass of a body is 5kg.
i) The mass of a body in kg f is also 5 kgf.
ii) The mass of a body in N is m x g = 5 x 9.8 = 49.03 N
1 Newton in Earth gravity is the equivalent weight of 1/9.80665 kg on Earth. This is derived using Newton's second law f=ma and assuming Earth gravity of 9.80665 m/s².

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