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.

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Sample Questions
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Question : 1

Unit of speed is __________.

Right Option : D
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Question : 2

A train covers a distance in 50 minutes,if it runs at a speed of 48 kmph on an average find the speed at which the train must run to reduce the time of journey to 40 minutes.

Right Option : B
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Question : 3

The distance between two stations is 20 km. If a train moves with a constant speed of 60 km/hr, then the time taken by the train to reach the next station is________________.

Right Option : B
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