For which of these can a Task Manager be used? prevent an application from becoming hanged

detect a hanged application

restart a hanged application

detect and end a hanged application

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.