Using a tag, set the color to green for all tags.

answer; certification; plz check first, i believe this is correct. good luck;

answer; defense;

answerthey protect the head and neck in rear impacts;

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.