An apple is initially sitting on the bottom shelf of a pantry. A hungry physics student picks up the apple to eat it, but changes her mind and puts the apple down on a shelf somewhere above its original location. During this process, the total work done on the apple by all forces is:

Zero

Explanation:

Work done is given by multiplying force and distance moved. The distance is moved both positive and negative and it's equal distance. Since force used is the same hence work

W=F*d+ (F*-d)=0

Therefore, total work done is zero

uranium fissions/breaks up giving out energy and neutrons