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SPEED

Meter (m) as the standard unit if measuring length,
Second (s) as the standard unit of measuring time and
Kilogram (Kg) as the standard unit of measuring weight are in common use.
These are the basic units of measurement.

When the speedometer of a moving vehicle indicates that its speed is 40 kilometers per hour, it means that the vehicle can travel 40 kilometers in the next hour. When we say that an athlete ran at a speed of 8 meters per second, it means that he ran 8 meters in one second. The speedometer indicates the speed at which the vehicle is traveling at the moment. The speed indicated on a speedometer is always in kilometers per hour or meters per second. That is the distance traveled in unit time.


SPEED = DISTANCE TRAVELED / THE TIME TAKEN



When time is measured in seconds and distance in meters, the unit of measurement of speed is meters per second. (m/s)

When the time is measured in hours and distance in kilometers, the unit of measurement
of speed is kilometers per hour. (Km/h)






Ex:-

A motor car takes 3 hours to travel 120Km. Find the average speed of the motor car.

Speed of the motor car = Distanace travelled/ The time taken

= 120 Km / 3 h

= 40 Kmh-

therefore Speed of the motor car

= 40 Kilometers per hour

Ex 2 :-

A vehicle travels for three hours with a speed of 60km/h. find the distance travelled by it.

speed = distance/time

therefore distance = speed x time

= 60 km/h x 3h

= 180 km

therefore the distance travelled by the car = 180 km

Okay, try this.

* An athlete ran the assigned distance with a speed of 8 meters per second, in 15s. find the distance travelled by him.

* Convert the speed of 50 meters per second to kilometers per hour.






Average Speed


Average speed = Total distance travelled / The time taken for the journey




Ex-3


find the time taken by a train which is 150m long and travelling at a speed of 50 meters per second to pass a signal post.

speed = distance / time

the time that elapses from the moment the front end starts paassing the signal post to the moment the rear end phases
it has to be calculated. during this time, the train should travel a distance of 150km which is its length.

since speed = distance / time

time = distance / speed

therefore the time taken to pass the signal post = 150m / 50ms-
= 3s (seconds)

OKay, try to this.

1-A cyclist travelled the first 10km at a speed of 20km/h , the next 15km at 15km/h and the last 5km at 10km/h. find the
average speed of the cyclist.

2-The distance between two towns A and B is 120km. Two motorcyclists X and Y start Simultaneously from A and B with speeds
of 40 km/h and 80km/h respectively, travel along straight paths and meet at a point between A and B. Find,

(1). the time taken to meet
(2). the position of the point at which they meet.



Exercise:-


A motor car takes 4 hours to travel from town A to town B which are 160km apart. find the speed of the motor car.

Find the time taken by a train 70m long to pass a platform 50m long travelling at a speed of 30km/h.

An athlete starting to run from a point A, runs at a uniform speed of 4m/s for one minute, and rests for two seconds
and runs a distance of 200m at a speed of 3m/s. find the average speed of the athlete.




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This is an educational site for increase your general knowledge and relax your mind. - SPEED (Daily life - Education)    -    Author : Imalka - Sri Lanka



2366 visitors since 2014-04-22
Last update : 2014-05-06

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