$1.$ Samer $($ms $=75$ kg$)$ is sitting on the seat of a swing at the playground. The seat is supported by two cables, one on each side of the seat. $($You may assume the seat has negligible mass.$)$ A$.$ Determine the tension in each cable due to Samer sitting on the swing seat. B$.$ Given each cable has a diameter of $1$ mm and each cable is exactly $5$ m long before Samer sits on the seat, determine the length of each cable when Samer is sitting on the seat. $($The cables are made of aluminum for which Y$=70$GN$/$m$^2)$