A block weighing 4500 N resting on a horizontal surface supports another block of 3000 N as shown in the figure . Find the horizontal force P required to just move the block to the left . Take the...

A block weighing 4500 N resting on a horizontal surface supports another block of 3000 N as shown in the figure . Find the horizontal force P required to just move the block to the left . Take the coefficient of friction for all contact surfaces as 0.3