The work W exerted over an object by a force F along a distance d is:
[tex]W=Fd[/tex]Substitute F=45N and d=4.6m to find the work done by the force of gravity on the falling object:
[tex]W=(45N)(4.6m)=207J[/tex]Therefore, the work done by the force of gravity when a 45N object falls a distance of 4.6m, is:
[tex]207J[/tex]