Hello!
The answer is:
The answer is the first option, 100 ft-lbs.
Why?
To calculate the work done by an object over a distance, we need to multiply the applied force by the amount of movement (distance).
So, to calculate the work that Gary needs to do to move the chair, we need to use the following equation:
[tex]Work=Force*Distance[/tex]
We are given,
[tex]Force=20lb\\Distance=5ft[/tex]
[tex]Work=F*D\\Work=(20lb)*(5ft)=100ft-lbs[/tex]
Hence, the answer is the first option, 100 ft-lbs.
Have a nice day!
