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The percentage errors in the measurement of mass and speed are 2% and 3% respectively. The maximum percentage error in kinetic energy is:
A5%
B8%
C11%
D14%
Answer & Solution
Correct answer: B. 8%
Kinetic energy $K=\frac{1}{2}mv^2$. For products and powers, maximum percentage errors add with their powers: $\frac{\Delta K}{K}\times100 = 2\% + 2\times 3\% = 8\%$.
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