Question

5 example of zero work done

Answer 1

When you set motion an object in space by the pushing it once and you must remain move literally forever.

Car start to move and end at the same place. coolie standing carrying bags and a man walking here and stopped at same place.  

hence  the student can  get right answer  for the   above question in a fine manner.

Answer 2

When a body moves around a circle

Then the work done =0

Because cos90=0