Distance covered by particle is 200.0 ± 0.4 m, and time taken to cover it is 18.0 ± 0.9 s. Percentage error in speed is :
A
7 %
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B
5.2 %
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C
2.5 %
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D
14 %
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Solution
The correct option is B 5.2 % % error in distance = △ss×100=0.4200×100=0.2
% error in time = △tt×100 = 0.918×100=5 v=st△vv×100=△ss×100+△tt×100
= 0.2 + 5 = 5.2 %