Please see the work below.
Work Step by Step
We know that $W_2-mgd=\Delta K_2=0$ This can be rearranged as: $W_2=mgd$ We plug in the known values to obtain: $W_2=(80.0)(9.80)(10.0)=7.84\times 10^3J$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.