A column AB 10 m long and 30 kN weight is hinged at A and is supported by a spring of stiffness K as shown in the figure. Which of the following statements are true?
1
If k = 1.5 kN / m, Column is in neutral equilibrium
2
If k > 1.5 kN / m, Column is in stable equilibrium
3
If k < 1.5 kN / m, Column is in unstable equilibrium
4
Cannot be determined.