Write true or false :
The S.I. unit of speed is $m s^{- 1}$ .

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Solution

The distance covered or travelled by a body in unit time is called the speed of a body.

$S p e e d = \frac{D i s t a n c e t r a v e l l e d}{T i m e t a k e n}$

In the S.I. system, distance is measured in metre $(m)$ and time measured in second $(s)$ , so the S.I. unit of speed is $m e t r e / s e c o n d (m s^{- 1})$ .
Hence the given statement is $True$ .

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