What Iis the phenomenon of the evolutionary trends of computer systems
​

i've had the same problem. i generally just ignore it, as a ton of these "verified answers" are completely wrong.

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.