Three identical masses are at the three corners of the triangle, connected by massless identical springs (rest length l0) forming an isosceles right angle triangle. If the two sides of equal length (of length 2l0) lie along positive x-axis and positive y-axis, then the force on the mass that is not at the origin but on the x-axis is given by  ax + by with (a) a = 1 and b = 0 (b) a = 0 and b = 1 (c) a = - root 2 and b = 1 (d) a = - 2 and b = 0 (e) a = - 2 and b = 1 . No links , please give a detailed explainatioin , ok