An object of mass $1 k g$ has a potential energy of $2 J$ . What is the height of the object relative to the ground? (Take g $= 10 m s^{- 2}$ )

1 m

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0.1 m

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0.2 m

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2 m

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Solution

The correct option is C $0.2 m$
Given,
Mass = $1 k g$ ,
Potential energy = $2 J$ ,
Let, h be the height of the object.
Potential energy of the body= $m \times g \times h$
$\Rightarrow$ $1 \times 10 \times h = 2 J$
$\Rightarrow$ $h = 0.2 m$

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