In a double block brake, as shown in Figure 16.8 (c), has drum radius \(=400 \mathrm{~mm}\), angle of contact \((2 \theta)=30^{\circ}\), coefficient of friction \((\mu)=0.25\), the force applied on spring \(=10 \mathrm{kN}\), and \(x=0.4 \mathrm{~m}\), \(I=1 \mathrm{~m}\), and \(c=0.1 \mathrm{~m}\). Find the braking torque applied.