cold water
A2. But before you close your mind, check out the Mpemba Effect in Wikipedia.
And to further improve your knowledge check out the Leidenfrost effect.
cold
hot
Cold air and hot water makes water freeze faster simply because the hot water is steaming and so the result is that there is less water to freeze. hot water = steam = less water less water = faster freeze cold air = faster freeze
No hot water freezes, it has to cool off first.
cold water
If you mean, compared with cold water, it doesn't. Hot water has to cool down first, before it freezes.
Cold water freezes faster because hot water has to cool down to the freezing temperature before it can freeze.
Hot and cold water and a freezer and a timer or stopwatch
It has been proven that hot water freezes faster than cold water.
Cold water, being the closest to freezing point, will obviously freeze the fastest. Hot water will freeze the second fastest, and salt water barely ever freezes, except in very cold conditions.
Kinetic energy
No. Both can freeze.