Answer:
15.68 Joules
Step-by-step explanation:
In physics, work is defined as the energy that is transferred to or from an object by a force that displaces that object some distance. The SI unit for work is a Joule, which itself is defined as 1 kg*m^2/s^2.
The attached file explains the steps to cacluate work done in raising the 2 kg book 0.8m.