Our answer has a repeating string of decimals and it goes on and on. However, we always choose the smallest number of significant figures, so, because the value given for the time (2.71 s) has only 3 significant figures, we will write our answer in the same manner: 8.56 m/s.
Tip: Make sure you round your last significant figure – In our case, 8.557… was rounded up to 8.56.
I used the online course to review topic 6 and i found it extremely useful. The videos were short, straightforward without feeling rushed. The best thing was that the answers to the quizzes where explained in videos, which really allowed me to understand where my mistake and weaknesses are.
I benefited the most from the calculator help videos, there were really great tricks that I used to save time during paper 2 exam. – F.N., English College in Prague, Czech Republic