Question: Maple interprets names as units

Hello, I just wanted to do a physics problem with Maple 10 and entered m := … to have the mass at my fingertips during the problem. But when I entered a speed it interpreted the "m" from meter as my "m" which I used as mass: I got around the problem by using the word "mass" instead of "m". Am I just doing it wrong by using too simple names, or is there something I can do in maple to prevent this? Thanks!
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