Only the change in kinetic energy or work done in slowing down the falling mass should be considered. The work done on the falling masses when they hit the floor or table has to be omitted because the energy involved is not transferred to the water.

Mechanical Equivalent of Heat
From the Tsukiji article at Japan-guide.com, I understand that they start taking names for auction visitors at 5am, and let the first 60 in at 5:25, and the next 60 in at 5:50.

Because the trains only start around 5:00, the earliest I can get to Tsukiji is 5:25. Should I still expect to get into the auction, or might I be too late to be one of the first 120 people on the list? I will be going there on a normal weekday (April 8-11).
