Question

after revolving Earth moon comes back to its own position and there is no displacement so there is no work done so do moon have kinetic energy even there is no work done

Answer 1

Dear student,
For theoretically circular motion at every position moon has constant orbital velocity which certainly shows change in kinetic energy to be zero thereby work done will be zero and when it comes back into its initial position. The displacement is 0 hence the work is 0.
Regards