In the two systems shown, all strings springs and pulleys are ideal. In figure-1 and figure 2 both the Springs are of same spring constant (k)

Options

A. The value of M is `12/7` kg, if the extension of the springs in both the arrangements is same
B. The value of M is `4/19` in kg if the extension of the spring is same 2k in both the arrangements is same
C. the spring force is `12/5` in figure-1
D. The value of Mis 4/17 kg, if the spring force in figure-1 is double that in figure-2

Answer

A, C