Advertisements
Advertisements
Question
If a sprinter runs a distance of 100 metres in 9.83 seconds, calculate his average speed in km/h.
Solution
Distance (d) = 100 m
Time (t) = 9.83 s
So, we can calculate the speed as :
`"Average speed" = "Total distance travelled"/"Time"`
Average speed for the entire journey :
= `100/9.83`
= 10.173 m/s
Now , we can convert it in km/h as :
= `((10.173)(3600))/1000`
= 36.62 km/hr
APPEARS IN
RELATED QUESTIONS
Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging?
- from A to B and
- from A to C?
A train travels the first 15 km at a uniform speed of 30 km/h; the next 75 km at a uniform speed of 50 km/h; and the last 10 km at a uniform speed of 20 km/h. Calculate the average speed for the entire train journey.
A car is moving along a straight road at a steady speed. It travels 150 m in 5 seconds:
How far does it travel in 6 seconds ?
Which of the following statement is correct regarding velocity and speed of a moving body?
Give one example of following motion :
Uniform velocity
Give one example of following motion :
Variable velocity
A train takes 2 h to reach station B from station A, and then 3 h to return from station B to station A. The distance between the two stations is 200 km. Find:
The average speed,
The average velocity of the train.
A car moving on a straight path covers a distance of 1 km due east in 100 s. What is velocity of the car?
Define uniform velocity and give one example.
Write down the type of motion of a body along with the A – O – B of the following distance – time graph.
