Question

what is speed? What are it's types?

Answer 1

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Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a given amount of time, while a slow-moving object covers a relatively small amount of distance in the same amount of time.

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Answer 2

Speed :
' The rate of distance travelled by the body in unit time interval '

...............................OR................................

' The distance travelled by the body per unit time '

Hence,

$speed = \frac{distance}{time}$


Different types of speed :
1) Average speed : The ratio of the total distance travelled by a body to the total time taken by the body.

$average \: \: speed \: = \frac{total \: \: distance \: \: travelled}{total \: \: time \: \: taken}$


2) Uniform speed : A body is said to be moving with uniform speed if it covers equal distance in equal intervals of time through out its motion.

example : Motion of a ball on a frictionless plane surface.


3) Non - Uniform speed : A body is said to be moving with non - uniform speed if it covers unequal distance in the equal intervals of time.

example : Motion of a ball moving on a rough surface.

4) Instantaneous speed : If the speed of a body changes continuously with time, it's speed at any instant is known as instantaneous speed, by finding the distance travelled by the body in a very short interval and then by dividing the distance by the time interval.