Two rigid blocks, of masses 10 kg and 15 kg, are arranged one on top of the other and placed on a horizontal rough surface as shown. The blocks are connected to each other through an inextensible cable passing over a frictionless pulley. The coefficients of static friction between the blocks and also between the bottom block and the surface are all equal to 0.3. The force P (in Newtons) needed to set the blocks in motion towards right is (Assume acceleration due to gravity g = 10 m/s) 10kg 15kg P