Advertisements
Advertisements
प्रश्न
If a sprinter runs a distance of 100 metres in 9.83 seconds, calculate his average speed in km/h.
उत्तर
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
संबंधित प्रश्न
Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?
What does the path of an object look like when it is in uniform motion?
Name the physical quantity obtained by dividing ‘Distance travelled’ by ‘Time taken’ to travel that distance.
Under which condition is the magnitude of average velocity equal to average speed ?
A ball hits a wall horizontally at 6.0 m s-1. It rebounds horizontally at 4.4 m s-1. The ball is in contact with the wall for 0.040 s. What is the acceleration of the ball ?
Give an example of motion in which the average speed is not zero but the average velocity is zero.
A car travels the first 30 km with a uniform speed of 60 km h-1 and the next 30 km with a uniform speed of 40 km h-1. Calculate :
The total time of journey,
The average speed of the car.
A car is moving with a velocity 20 m s-1. The brakes are applied to retard it at a rate of 2 m s-2. What will be the velocity after 5 s of applying the brakes?
Define variable velocity and give one example.
How many variables are present in each equation of motion?
