Question

Child A is preparing for exams in his study room at his table. Child B climbs a tree several feet high on the grounds who has done more work and why

Answer 1

Work=force ×displacement so child A is just sitting so no displacement that is why no work is said to be done.
while child B has displaced from his positon so he does more work.

Answer 2

child A done more work because he is preparing for exams and child B climbs a tree several feets high on the ground but there is no use . that's why child A done more work