Jack pushed and pushed, and finally moved the new refrigerator into the kitchen. what is the best explanation of what happened?
a) jack used energy to do work.
b) jack had no energy and did no work.
c) jack used all his potential energy.
d) jack used energy but the refrigerator did all the work.

A) Jack used energy to do work.

Explanation:

When Jack pushed and pushed the refrigerator then the force on the refrigerator by Jack will displace the refrigerator and hence we can say that work is done by the Jack

Work done is given as

since force is applied by Jack and also the refrigerator is also displaced by this force.

So we can say that work done by Jack will help to move the refrigerator on the floor.