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InterviewSolution
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A body travels uniformly a distance of `( 13.8 +- 0.2) m` in a time `(4.0 +- 0.3) s`. Find the velocity of the body within error limits and the percentage error.A. `(3.5+-0.6)ms^(-1)`B. `(3.5+-0.3)ms^(-1)`C. `(6.1+-0.6)ms^(-1)`D. `(6.1+-0.3)ms^(-1)` |
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Answer» Correct Answer - B Here, `s=(13.8+-0.2)m,t=(4.0+-0.3)` s `therefore"velocity",v=(s)/(t)=(13.8)/(4.0)=3.45ms^(-1)` (Rounded off to first place of decimal) `therefore(Deltav)/(v)=(Deltas)/(s)+(Deltat)/(t)=(0.2)/(13.8)+(0.3)/(4.0)=(0.8+4.14)/(13.8xx4.0)=(4.94)/(13.8xx4.0)` `=0.0895` or `Deltav=vxx0.0895=3.45xx0.0895=0.3087` `therefore` Velocity `=(3.5+-0.3)ms^(-1)`. |
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