The state of stress at a point, for a body in plane stress, is shown in the figure below

Q. The state of stress at a point, for a body in plane stress, is shown in the figure below. If the minimum principal stress is 10 kPa, then the normal stress s _y(in kPa) is

(A) 9.45                      (B) 18.88                    (C) 37.78                   (D) 75.50

Ans: 37.78