Answer:
joule is SI unit of work or energy.
As work = force x distance = (mass x ace.) x distance
\[\therefore \] \[Work=mass\times \frac{dis\tan ce}{tim{{e}^{2}}}\times dis\tan ce=\frac{mass{{\left( dis\tan ce \right)}^{2}}}{tim{{e}^{2}}}\]
Hence \[J=\frac{kg\,{{m}^{2}}}{{{s}^{2}}}=kg\,{{m}^{2}}{{s}^{-2}}\]
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