what is speed

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what is speed

Question 1 – Define the term speed. What are its various units ? Is it a scalar or vector quantity ?

what is speed

Ans. Speed;- Speed is defined as the distance travelled by a body per unit time. Thus,
Speed=Distance travelled / Time taken
or
v=s/t

The S.I unit of speed is ms-1, whenever the distance covered by body is expressed in metre and time in second.
A smaller unit of speed is cm s-1
A larger unit of speed is km h-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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