the tires are made of rubber. when rubber gets wet, it gets slippery, which means less friction from the tires to the ground, making it easy for the car to keep going instead of stopping. also, a car is very heavy, so momentum definitely kicks in ALOT.
think of it this way. car tires that are dry + dry land = alot of friction and quick stopping. but make every thing slippery and the friction goes away.
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