High school physics problem?

Posted on 2014-11-17 06:23:00 in Physics by MARTIN

A frictionless pulley is fixed onto a table. There are two horizontal cords coming out from the left of the pulley (one above and one below). The lower cord is attached to block B, and the upper cord is attached to Block A. Block A is on top of block B. Block A weighs 2.70 N, and block B weighs 5.40 N. The coefficient of kinetic friction between all surfaces is 0.25. Find the magnitude of the horizontal force F necessary to drag block B to the left at a constant speed if blocks A and B are connected by the light, flexible cord passing around the fixed, frictionless pulley.

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