show that \(\mu = 0.35\).
(6)
A second load of weight \(k W\) is now placed on the ladder at \(A\). The load of weight \(4 W\) is removed from \(C\) and placed on the ladder at \(B\). The ladder is modelled as a uniform rod which is in a vertical plane perpendicular to the wall. The loads are modelled as particles. Given that the ladder and the loads are in equilibrium,