5.
\begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{2108a1be-0214-42c4-9cb4-8622cc0fa496-3_318_832_1165_452}
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\caption{Fig. 2}
\end{figure}
Figure 2 shows a large block of mass 50 kg being pulled on rough horizontal ground by means of a rope attached to the block. The tension in the rope is 200 N and it makes an angle of \(40 ^ { \circ }\) with the horizontal. Under these conditions, the block is on the point of moving.
Modelling the block as a particle,
- show that the coefficient of friction between the block and the ground is 0.424 correct to 3 significant figures.
(6 marks)
The angle with the horizontal at which the rope is being pulled is reduced to \(30 ^ { \circ }\). Ignoring air resistance and assuming that the tension in the rope and the coefficient of friction remain unchanged, - find the acceleration of the block.
(6 marks)
Turn over