Question

You exert of force of 75 newtons on a rock. You push and you push, but you can't budge it. You are exhausted! How much work did you perform?

Answer 1

work = force x distance
distance = 0, work = 0
no work done

Answer 2

A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction