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Q.

Which one of the following is a unit of speed?

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a

Km

b

m s^{- 2}

c

km h^{- 1}

d

m s^{- 1}

answer is D.

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Detailed Solution

The unit of the speed is meter per second or

m s^{- 1}

.
We find that different objects may take different times to cover a given distance. Some of the objects move fast, but some objects move slowly. To know about slow or fast motion, we have a term known as speed. The speed of a moving object is the distance travelled by it in a unit of time. A mathematical expression of speed is given below.

Speed = \frac{distance}{time}

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