Each of these boxes, which have weights as indicated, is pushed for 2 meters across a frictionless floor by the indicated forces. Rank these, from greatest to least, in terms of their change in kinetic energy.
A. (AC)(BD)H(EFG)    B. A(BC)DEF(GH)    C. (EFG)H(BD)(AC)
D. (HG)FED(BC)A    E. (AFH)(CE)(BDG) F. None of the above

What about by velocity?