A-Level Maths: R3-04 [Forces: Maximum Tension Problem]

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I notice that in this video you didn't round answers to 2 sf. Did you just forget, or are there particular circumstances under which you should and should not round to 2sf? Also, would I lose marks in the exam for not rounding to 2sf when I have used g=9.8? I am on OCR MEI. Thanks so much for your help.

sherlyns