Question

Define the term speed. what are its various units? is it a scalar or vector quantity?​

Answer 1

Answer:

Two scalar quantities can also be multiplied or divided by each other to form a derived scalar quantity. For example, if a train covers a distance of 100 km in 1.0 h, its speed is 100.0 km/1.0 h = 27.8 m/s, where the speed is a derived scalar quantity obtained by dividing distance by time.

Answer 2

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$\huge\bf{\underline{\purple{Answer:}}}$

Speed is defined as the distance travelled by a body per unit time. Thus,

$\Rightarrow{\boxed{\sf{\pink{ Speed= \dfrac{Distance\:travelled}{Time\:Taken}}}}}$

or

$\Rightarrow{\boxed{\sf{\red{v= \dfrac{s}{t}}}}}$

The SI unit of speed is $\displaystyle{\sf{ms^{-1}}}$,whatever the distance covered by body is expressed in metre and time in second.

A smaller unit of speed is $\displaystyle{\sf{cms^{-1}}}$.

A larger unit of speed is $\displaystyle{\sf{kmh^{-1}}}$,

Speed is a scalar quantity because it has only magnitude and no direction. The speed of a body tells us how fast or how slow the body is moving. But it does not give the direction of motion.

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