ANSWER and EXPLANATION
We want to know how to tell if work is done on an object.
Work is a result of a force acting on an object that thereby causes a displacement of the object. It is defined mathematically as:
![W=F\cdot d](https://img.qammunity.org/2023/formulas/physics/college/kgx983ena5n58pjn3ga2ml2ln51sad2jev.png)
where F = force; d = displacement
Therefore, we say that work is done on an object when a force is applied to the object and it causes the object to move a certain distance.