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O kelvins is known as absolute zero. When all matter is in a frozen state.
I will assume you meant to ask, "What is absolute zero?" Absolute zero is the lowest possible temperature, at -273 degrees Celsius, or 0 Kelvins.
Celsius and Kelvin scales use the same size unit or "degree." But Kelvin has its zero point at absolute zero rather than the freezing point of water. Absolute zero (zero K) is about -273.15° Celsius.To convert Celsius to Kelvin, add 273.15. For example 100° C is 373.15 kelvins.To convert kelvins to Celsius, subtract 273.15. For very large numbers, such as 5000 K, the value (4726.85° C) is not going to be that different.
The slope of a straight line can't be measured in units. If it is a horizontal line then there is no slope because the rise over run is 0/x, which equals zero because zero divided by everything is zero. If the line is vertical then the slope is undefined because the rise over run is x/o.
For motion at constant speed along a straight line, the acceleration is zero.