I just got done taking a test, and one question really was bothering me. My teacher had one problem where there was 20 m/s^2, this is one signifigant digit? Right? Yet last time I gave my answer in one signifigant figure, I got a lecture and told he'ld let me get away with it this time. I ended up not doing it on this test but it really is bothering me. Should I have just done it anyways? I can justify it with the textbook we use and probally somebodies notes of him as well. :grumpy: As it is I circled it, wrote a note, and underlined it darkly several times.