Asign is suspended by two cables and hangs at rest. indentify the forces ?

The forces that act upon the suspending signage are as follows: (1) weight of the signage. This force is due to the pull of gravity. (2) Tensions (both x and y-components). Since there are 2 cables attached to the signage then, both of this cable will exert tension to the signage, pulling it upward. 

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

The magnets are probably damaged or there not strong enough to attached to the refrigerator