Section: Solid Mechanics | Type: NAT | Marks: 2
A rigid massless bar PQR is hinged at its end P and supported through a spring of stiffness k at point Q. A vertically downward force W = 560 N is applied at the free end R of the bar. If the vertical component of the displacement at R is 30 mm, then the stiffness of the spring (in kN/m, rounded off to one decimal place) is ___.
Answer: 41.0 to 43.0