(20 12? Zhenping county simulation) as shown in the figure: Under the action of horizontal pulling force F, the object A with the weight of 10N moves in a straight line along the horizontal table, and the spring dynamometer B. (1) The pointer of the spring dynamometer B is equal to the tension of the rope, so the object A is subjected to the tension F rope =12n;

As can be seen from the figure, if the effective number of strands of the rope is 2, then F rope = 12F, F rope = 2×12n = 24n;

(2) The number of strands is 2, the distance of pulling force is s =12sa =12× 2m =1m, and the work of pulling force is w = fs = 24n×1m = 24j;

So the answer is: 24; 24.