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If you apply $1\ J$ of energy to lift a book of $0.5\ kg$, how high will it rise? [Take $g=10\ ms^{-2}$]
Energy used to lift the book $P=1\ J$
Mass of the book $m=0.5\ kg.$
$g=10\ ms^{-2}$
Let the height $h=?$
Energy used $P=mgh$
Therefore, $0.5\times10\times h=1$
Or $5h=1$
Or $h=\frac{1}{5}\ m=0.2\ m$
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