Please, can anyone check it?

Block A weighs 1.40 N, and block B weighs 4.20 N. The coefficient of kinetic friction between all surfaces is 0.30. Find the magnitude of the horizontal force necessary to drag block B to the left at constant speed if A and B are connected by a light, flexible cord passing around a fixed, frictionless pulley.

Question

Please, can anyone check it?

Block A weighs 1.40 N, and block B weighs 4.20 N. The coefficient of kinetic friction between all surfaces is 0.30. Find the magnitude of the horizontal force necessary to drag block B to the left at constant speed if A and B are connected by a light, flexible cord passing around a fixed, frictionless pulley.

nikita2 · Answer

this is my solution. But is it correct?

nikita2 · Answer

Actually, I've found the right solution. It is

anonymous · Answer

Yes, that's correct. The solution is also here: (Problem 4) http://web.mit.edu/8.01x/www/probsets/sol4.pdf

nikita2 · Answer

Thank you.