The natural frequency of a vibrating foundation system

i) increases as the square root of the spring stiffness

ii) decreases with the square root of the spring stiffiness

iii) increases as the square root of the mass of the body

iv) decreases with the square root of the mass of the body

of these statements:

- 1
  
  (i) and (iii) are correct
- 2
  
  (i) and (iv) are correct
- 3
  
  (ii) and (iii) are correct
- 4
  
  (ii) and (iv) are correct

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