**Sample Problem 7-4a**
The work done by the force of gravity is -5096J

**Sample Problem 7-4b**
The work done by Chemerkins force is 5096J

**Sample Problem 7-4c**
The Work done in helding the object stationary is 0, as the dispacement is 0

**Sample Problem 7-4d**
The work done by the gravity is 279J