maybe the solution is like this:

first find the vol of the cylinder use this formula

Volumecylinder = pi r2 h

=pi(0.5)2 (4)

=3.141592

then use density=mass×volume to find the mass

673=m×3.141592

m=214.22kg

F=ma

=214.22kg×9.8

=2099.38

use 9.8 as a because of the force of gravitation

work done =force×displacement

=2099.38×3