For the following problems, I don't know how to start . Please explain every step to me with emphasis on the difference in finding the blocks' acceleration accompanied by the coefficient of friction and the case if it was not present. [I have other problems I need to do.] Find each block's acceleration. 1. A 20 kg block (A) rests on a table; a cord attached to the block extends horizontally to a pulley at the edge of the table. A 10 kg mass, which has the shape of a block, (B) hangs at the end of the cord. The coefficient of [kinetic] friction is 0.5. 2. A 40 kg block slides down an inclined plane. The incline is 35° and the coefficient of friction is 0.2. Thanks a million.