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Olympiad-Science
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Class 9
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An object falls off a height of 3m does a work of 147 Joules. Then the mass of the box is
$\begin{array}{1 1} (a)\; 49 \;kg \\ (b)\; 49 \;N \\ (c)\; 5\;N \\ (d)\; 5\; kg \end{array}$
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