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hey guys physics cie help .please

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cashem'up:
In an experiment, a radio-controlled car takes 2.50 ± 0.05 s to travel 40.0 ± 0.1 m.
What is the car’s average speed and the uncertainty in this value?..........

m getting 0.36 but markscheme says 0.4

*Hope*:
oh this is in paper 1 right?
ok u see the minimum number of significant figures in the uncertainity is 2 (if u include the zeros)
so the actual answer is 0.36 but we must round to 2 s.f so we will get 0.4
hope i helped! ;)

Amr Fouad:
Thanks lolo :)

+ rep. for helping others

nid404:
ohh....so uncertainties always have to be 2sf....i wsn;t aware of that either. :o

*Hope*:
No it actually depends on the given values in the question but always round to the least number of s.f given in the question
Thanks for +rep ;D

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