6.
\begin{figure}[h]
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\caption{Figure 3}
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\end{figure}
A box of mass 30 kg is being pulled along rough horizontal ground at a constant speed using a rope. The rope makes an angle of \(20 ^ { \circ }\) with the ground, as shown in Figure 3. The coefficient of friction between the box and the ground is 0.4 . The box is modelled as a particle and the rope as a light, inextensible string. The tension in the rope is \(P\) newtons.
- Find the value of \(P\).
The tension in the rope is now increased to 150 N .
- Find the acceleration of the box.