<p>A body of mass 2 kg&nbsp;is initially at rest. It starts moving unidirectionally under the influence of a source of constant power P. Its displacement in 4 s is&nbsp;<span class="equation">\(\frac{1}{3}\alpha^2\)</span><span class="equation">\(\sqrt{P}\)</span>m.</p>

<p>The value of&nbsp;<span class="equation">\(\alpha\)</span>​​​​​​​ will be________.</p>