In the image below, the athlete will cover a certain distance in a certain time.
This is called Speed.
The speed of these cars is over 150 kilometers per hour (150 km/h).
Speed is how fast something is moving
Speed is a measure of the distance travelled in a given time.
Distance is measured in Metres and Kilometres as the distance travelled per unit of time.
Time is measured Seconds, Minutes and Hours
An athlete runs around a circular track on a field of diameter 336 m in 5 minutes. She adjusts her shoes for 30 seconds then covers the second lap in 6 minutes.
(a) her speed in km/h during the first lap.
(b) her average speed for the whole time interval (take π = 22/7)
Distance = 2`Pir`
`= 2 x 22/7 x 336/2`
`= 1056 meters`
`1 Km = 1000 M`
5 `1/2 mins`
`=` 5`1/2` ` ``-:60`
= `1056/1000 x 120/11`
`(2 x 1056m ) for 2 trips`
`= 2 x 1056/1000Km`
= 5 `1/2 mins + 1/2 mins + 6 mins`
= 12 mins
= `12/60 hrs`
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