A body of mass 1kg begins to move under the action of a time dependent force $\overrightarrow F = \left( {t\widehat i + 3{t^2}\,\widehat j} \right)$ N, where $\widehat i$ and $\widehat j$ are the unit vectors along $x$ and $y$ axis. The power developed by above force, at the time t = 2s, will be ____________ W.