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constant variable
A clock.
2521
no. speed of light is always constant . as long as the light stays in the same medium. the speed is generally slightly different in different media.
The absolute value of any number, or y, is always positive. If y is negative, than the answer is negative y (for example, the absolute value of -3 is 3); if y is zero, it stays zero; and if it is positve, it stays positive (for example, 15 is still 15).