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# The basic unit of speed is:

$(i).\ km/min$

$(ii).\ m/min$

$(iii).\ km/h$

$(iv).\ m/s$

The correct answer is: $(iv).\ m/s$

__Explanation:__

Distance traveled per unit of time by a moving object is called its speed.

So, $\boxed{Speed=\frac{Distance}{Time}}$

__Derivation of the basic unit of speed:__

Distance is the length of the path traveled by a moving object. The SI unit of distance is $meter$ which is abbreviated as $m$.

The SI unit of time is **$second$ **which is abbreviated as $s$.

The SI unit of speed $=\frac{unit\ of\ distance}{unit\ of\ time}$

$=\frac{meter(m)}{second(s)}$

Therefore, the SI unit or basic unit of speed is meter per second$(m/s)$.

__Note:__

$km/min$, $m/min$, and $km/h$ are also units of speed but only $m/s$ is the basic unit or SI unit of the speed.

So, option $(iv)$ is correct.

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