A block of weight W1 = 1000 N rests on a horizontal plane and supports on top of it another block of weight W2 = 250 N as shown in FigQ4. The block W2 is attached to a vertical wall by an inclined string which makes an angle of 60° with the wall. What should be the value of horizontal force ‘P' to cause motion of the lower block to impend? Also find the corresponding tension in the string. Take µ = 0.3 for all surfaces.