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<a accesskey="3" href="page.php?w=acceleration&amp;p=2">3.Next</a>
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<p>{dt} = \frac{d^2\mathbf{x}}{dt^2}| dimension = wikidata}}</p>

<p><a href="page.php?w=Image%3ADonPrudhommeFire1991KennyBernstein.jpg">thumb</a>In <a href="page.php?w=physics">physics</a>, <b>acceleration</b> is a measure of how fast and in what direction an object's <a href="page.php?w=speed">speed</a> and <a href="page.php?w=direction_%28geometry%29">direction</a> of <a href="page.php?w=motion">motion</a> are changing. It is defined as the <a href="page.php?w=time_derivative">rate of change</a> of the <a href="page.php?w=velocity">velocity</a>.</p><p>
<a accesskey="3" href="page.php?w=acceleration&amp;p=2">3.Next</a>
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