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# A man runs 100.5 m in 10.3 seconds. What is his average speed up to approximate significant figures?

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The average speed is $\large\frac{100.5}{10.3}$$\approx 9.708737 ms^{-1}$
However, distance has 4 significant figures but the time has only 3. Therefore the result rounded off to 3 digits is $9.71 \;ms^{-1}$
answered Jul 12, 2014