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Home  >>  JEEMAIN and NEET  >>  Physics  >>  Class11  >>  Units and Measurement

The value of Kinetic energy $K$ and potential energy $V$ are measured as follows $K=100.0 \pm 2.0\; I \quad V=200.0 \pm 1.0\; I$. What is the percentage error in measurement of mechanical energy ?

\[(a)\;2.5 \% \quad (b)\;1 \%\quad (c)\;0.5 \%\quad (d)\;1.5 \%\]

1 Answer

 
$ME=K+V=E+\Delta E$
$ME=K+V=300 \pm 3$
$\%$ error in $ME=\large\frac{\Delta E}{E}$$\times 100$
$=\large\frac{3}{300} $$\times 100$
$=1 \%$
Hence b is the correct answer.
 

 

answered Jun 17, 2013 by meena.p
edited Mar 14, 2014 by thagee.vedartham
 

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