Block A weighing 1000 N rests over block B which weighs 2000 N as shown in Fig. Block A is tied to a wall with a horizontal string. If the coefficient of friction between A and B is 1/4 and that between B and the floor is 1/3, what value of force P is required to create impending motion if (a) P is horizontal, (b) P acts 30° upwards to horizontal?
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