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\phantom{1}\\  For the last question of part 1, the key thing for students to realise is that if 10 coins were used then each relative uncertainty would decrease by a factor of 10, which would ultimately propagate to 10 times the precision. Writing out the whole derivation would probably take too long, so I wouldn’t be picky about that.\\  \phantom{1}\\  In part 3 (measuring reaction time), the free-fall distance associated with a reaction time of 0.18s is 16.2cm. This should be what people aim for, but it is difficult to test this in a reliable manner in the lab, so expect results to vary wildly - results will most likely be within the range of 10cm - 40cm. 40cm.\\  \phantom{1}\\  \textbf{Key Discussion Points}  Section 1.3 - Archimedean method of determining volume by placing the coin in water and measuring the volume of displaced water would be good example.\\