The correct answer is Boy pushing a wall in a room. Boy pushing the wall in the room is not an example of work done. When a boy pushes a wall, he is applying force on the wall.
Which of the following does not work?
If the shift angle is 90 degrees, no work is done. H. Cosθ is zero. Therefore, this explains why a person standing upside down with a basket of fruits does no work.
Work is the force applied over a distance. Examples of work include lifting an object against gravity, driving a car up a hill, or pulling down a tethered helium balloon. Work is a mechanical manifestation of energy. The usual unit of work is joules (J), which is equivalent to Newton meters (N m).
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