<p>A body of mass &#39;m&#39; is launched up on a rough inclined plane making an angle of&nbsp;<span class="equation">\(30^0\)</span>&nbsp;with the horizontal. The coefficient of friction between the body and plane is&nbsp;&nbsp;<span class="equation">\(\frac{\sqrt{x}}{5}\)</span>&nbsp;​​​​​​​if the time of ascent is half of the time of descent. The value of x is __________.</p>