Speed

Physics

definition

Average speed

Average speed is defined as the total distance travelled by the body in total time i.e.

It is a scalar quantity. Its unit is m/s.

definition

Speed

Speed is rate of change of distance,it is the measurement of how fast or slow objects move, can be given by formula,

S.I unit of speed is

shortcut

Speed by distance moved and time taken by an object

Example : During inter school running race competition , Shivam completed the race of  200 m in 120 seconds, where as the winner of the race Anubhav completed it in just 80 seconds.What would be the required speed of Shivam to beat  Anubhav?
Solution: Speed of Shivam
Speed of Anubhav
Hence to win the race speed of shivam should have been more than

REVISE WITH CONCEPTS

Understanding Uniform and Non-Uniform Motion

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Basic Introduction to Velocity

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Average Speed and Average Velocity

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Instantaneous Velocity and Instantaneous Speed

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Velocity - Time Graph

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Important Questions

A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is : 

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An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

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A car travels from A to B at a, speed of and returns at a speed of . The average speed of the car for the whole journey is:

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Joseph Jogs from one end  to the other end  of a straight  road in  minutes  seconds and then turns around and jogs  back to point  in another  minute. What are Joseph's average speeds and velocities in jogging (a) from  to  and (b) from  to ?

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A man walks on a straight road from his home to a market  away with a speed of . Finding the market closed, he instantly turns and walks back home with a speed of . What is the
(a) magnitude of average velocity, and
(b) average speed of the man over the interval of time
(i)  to ,
(ii)  to  
(iii)  to

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A car travels the first one third of a certain distance with a speed of 10 km/hr, the next one third with a speed of 20 km/hr and the last one third distance with a speed of 60 km/hr The average speed of the car for the whole journey is

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The position of an object moving along x-axis is given by x = a + , where a = 8.5 m and b = 2.5 m and t is measured in seconds. The average velocity of the object between t = 2 s and t = 4 s is

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A car covers the first half the distance  between two places at 40 km/h another half at 60 km/h, the average speed of car

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A motorcyclist drives from A to B with a uniform speed of and returns with a speed of . Find the average speed.

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Abdul, while driving to school, computes the average speed for his trip to be km . On his return trip along the same route, there is less traffic and the average speed is km . What is the average speed for Abdul's trip?

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