On earth the weight of a body of mass $1.0 k g$ is $10 N$ . What will be the weight of a boy of mass $37 k g$ in
a) $k g f$
b) $N$ ?

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Solution

Given, the weight of mass $1 k g$ body is $10 N$ .
$W = m g$ ,
$10 N = 1 k g \times g$
$g = 10 N k g^{- 1}$

(a) $1 k g f$ is the force of attraction of the earth on the mass of $1 k g$ . Earth will attract the body of $37 k g$ with a force of $37 k g f$ .

(b) Given, $Mass of the body (m) = 37 k g$ ,
To find, Weight ( $W$ )
$W = 37 k g \times 10 N k g^{- 1}$
$= 370 N$

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