Speed of an Object


 
 
Concept Explanation
 

Speed of an Object

Speed :

Speed is the distance traveled per unit time. It is a way of measuring how quickly something is moving or being done, or something moving fast.

Calculation of speed:

The instrument/ meter measuring the speed of the vehicle is called a speedometer. The distance traveled by the vehicle is given by an instrument called odometer.

We can calculate speed from the given formula.

                                 large Speed:= ; frac{Distance}{Time}

The SI unit of speed is meter per second(m/s). We also calculate speed as kilo meter per hour(km/h).

We can calculate the speed of an object if we know the distance it travels in a given amount of time. Let us see how this is done.

Illustration 1:, In a 100 m race Shreya ran the race in 20 s. What is Shreya’s speed?

Solution:As speed is the distance traveled in unit time, Shreya’s speed is the distance traveled in unit time. Shreya’s speed can be calculated by dividing the distance she ran by the time she took to cover that distance. Therefore, Shreya’s speed is:

Speed= frac{distance}{time}= frac{100m}{20s}= 5;m/s

Speed is a way of measuring how quickly something is moving or being done, or something moving fast.

Illustration 2: If a person covers a distance of 15 m in 5 seconds then find out the speed of the person.

Solution: As we know,

    Speed:= ; frac{Distance}{Time}

  Therefore, 

    Speed:= ; frac{15}{5}:=:3:m/s

Illustration 3: A car is moving with a speed of 50 m/s in time 20 seconds. Find out the distance covered by the car in given time period.

Solution: We know that

      Speed:= ; frac{Distance}{Time} 

    Distance:=:Speed:times:Time

    Distance =  50 X 20 = 1000 m/s = 1 km/s 

 

Sample Questions
(More Questions for each concept available in Login)
Question : 1

A car moves with a speed of 60 km/hr for 20 min and then at a speed of 30 km/hr for the next 20 min. The total distance covered by the car is ____________________________ km.

Right Option : C
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Explanation
Question : 2

A person crosses a 60 meter long street in 5 minutes.what is the speed in km/hr

Right Option : B
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Explanation
Question : 3

A certain distance is covered in 3 h 48 min at 5 km/h. How much time will be taken to cover it at 28.5 km/h^{2} ?

Right Option : B
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Explanation
 
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