Average speed of an object in a time interval is equal to the total distance travelled divided by the total time taken.
Different units of speed: The SI unit of speed is meter per second. Another commonly used is kilometer per hour. When we talk about speed of aeroplanes and cars, it would be more appropriate to use km/h than m/s.
Let us take an example to understand this concept :
Illustration 1: In traveling form Pune to Nagpur, Rahul drove his bike for 2 hours at the speed 6 kmph and 3 hours at 70 kmph. Find his average speed
Solution : We know that,
Distance = Speed x Time
So, in 2 hours, distance covered = 2 x 60 = 120 km
In the next 3 hours, distance covered = 3 x 70 = 210 km
Total distance covered = 120 + 210 = 330 km
Total time = 2 + 3 = 5 hrs
Average speed :
The odometer of a bus reads 6700 km when it starts from the station at 9 a.m., and when it comes back to the station at 10 p.m. the odometer reading is found to be 6960 km, then the average speed of the bus in the whole journey is __________________ km | |||
Right Option : B | |||
View Explanation |
An object completes one round of circle of radius 7 m in 20 sec.Distance travelled after 10 sec is | |||
Right Option : B | |||
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A cheetah the fastest of all the land animals over a short distance accelerates from rest to 26 m/s in two seconds.assuming the acceleration is constant find the average speed of cheetah? | |||
Right Option : C | |||
View Explanation |
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