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If a sprinter runs a distance of 100 metres in 9.83 seconds, write his average speed in km/h.
Distance travelled by the sprinter $d=100\ m$
Time taken $t=9.83\ sec.$
Therefore, average speed of the sprinter $v=\frac{distance}{time}$
$=\frac{100\ m}{9.83\ sec.}$
$=10.18\ ms^{-1}$
Therefore, average speed of the sprinter is $10.18\ ms^{-1}$.
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