Theory:

In this exercise, We will learn about speed and its various types.
 
Speed simply tells us how fast an object can move.
 
Speed is a scalar quantity, which only tells the magnitude (numerical value) of how much speed that an object travels.
 
Speed:
Speed is the rate of change of distance.
  
Speed=Distance(d)Time(t)
The SI unit of speed is meter(m)second(s)=ms=ms1
 
And, if we want to calculate the distance using speed and time, we can use the following formula,
 
Distance=Speed×Time.
We can classify the speed into two types with respect to distance and time.
 
Two types of speed:
  • Uniform speed
  • Non-uniform speed
Uniform speed:
If an object in motion covers equal distances in equal intervals of time, then the object is said to be at a uniform speed.
Example:
In our daily, life we can see the uniform motion in the following situation:
 
1. The circulation of blood in our body.
 
2. Movement of hands in a watch.
 
3. The movement of the fan and mixer in our kitchen at a particular speed.
 
4. The Earth and Moon rotate almost at a uniform speed.
Non-uniform speed:
If an object covers unequal distances in equal intervals of time, the object is said to be in non-uniform speed.
Example:
1. A car coming to a halt.
 
2. The object will moves at non-uniform speed, if it is thrown into the air, -for example, a cricket ball or stone.
 
3. The moment of a vehicle in traffic.
Average speed:
We can calculate the average speed of an object by dividing the total distance travelled by the object and the total time taken to travel the distance.
 
That is, Averagespeed=Thetotal distance travelledThetotal time taken to travel the distance