<p>The potential energy of a particle of mass 4kg&nbsp; in motion along the x-axis is given by U = 4(1-cos 4x)J. The&nbsp;time period of the particle for small oscillation (sin<span class="equation">\(\theta\simeq \theta\)</span>) is&nbsp;<span class="equation">\((\frac{\pi}{K})\)</span>​​​​​​​s. The value of K is_______</p>