3.
\begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{ab3c0d61-3cab-4050-8288-6052e8404eb1-06_182_872_310_543}
\captionsetup{labelformat=empty}
\caption{Figure 1}
\end{figure}
A small box is pushed along a floor. The floor is modelled as a rough horizontal plane and the box is modelled as a particle. The coefficient of friction between the box and the floor is \(\frac { 1 } { 2 }\). The box is pushed by a force of magnitude 100 N which acts at an angle of \(30 ^ { \circ }\) with the floor, as shown in Figure 1.
Given that the box moves with constant speed, find the mass of the box.