A greased pig has a choice of three frictionless slides along which to slide to the ground. Rank the slides according to how much work the pig’s weight does on the pig during the descent, greatest first.

  1. WA > WB > WC
  2. WC > WB > WA
  3. WA = WB = WC
  4. WA < WB < WC
  5. WC < WB < WA