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The correct symbol to represent the speed of an object is
$(a)$. $5\ m/s$
$(b)$. $5\ mp$
$(c)$. $5\ m/s^{-1}$
$(d)$. $5\ s/m$
The SI unit of speed is meter per second and it is written as $m/s$ or $ms^{-1}$
So, option $(a)$ is correct.
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