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Which of the following relations is correct?
$(i).\ Speed=Distance\times Time$
$(ii).\ Speed=\frac{Distance}{Time}$
$(iii).\ Speed=\frac{Time}{Distance}$
$(iv).\ Speed =\frac{1}{Distance\times Time}$
The correct answer is: $(ii).\ Speed=\frac{Distance}{Time}$
Explanation:
Distance traveled per unit of time by a moving object is called its speed.
So, $\boxed{Speed=\frac{Distance}{Time}}$
The above relation can also be expressed in the following ways:
$\boxed{Time=\frac{Distance}{speed}}$
$\boxed{Distance=Speed\times Time}$
SI unit of speed is meter per second$(m/s)$.
Therefore, only $\boxed{Speed=\frac{Distance}{Time}}$ is the correct relation among the given relations.
Hence, option $(ii).\ Speed=\frac{Distance}{Time}$ is correct.
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