8.7 A thick homogeneous inextensible line of length \(l\) and mass \(M\) is initially fastened by both ends to two hooks which are close to each other, and hangs freely as shown in Figure 3. Then one end of the line is released and begins to fall. The largest load \(N\) which each of the hooks can bear is greater than the weight of the line. What conditions must \(Mg\) and \(N\) fulfil in order that the second hook is not ripped out? We assume that during the fall each element of the line reaches its final position and later remains at rest. ( \(N\ge2Mg\))