Who established computer​

↳Charles Babbage, an English mathematician and inventor, is credited with inventing the first automatic digital computer. Babbage devised plans for the Analytical Engine in the mid-1830s.

you paid for the subscription lol

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.