A car is traveling at a speed of 23 m/s. What is its speed in kilometers per hour?Is it exceeding the 135 km/h speed limit?

Just use the conversions for distance and time, watch the units cancel themselves:

23m/s * (1km / 1000m) * (60s / 1min) * (60min / 1hr) =

82.8 km/h

23 m/s =

23 * ( (1/1000) / (1/(60*60)) ) km/h

23 * 3.6 km/h

82.8 km/h

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82.8 km/h < 135 km/h

23 meters/second (60 seconds/minute) * (60 minutes/hour) * (km/1000 meters) = 82.8 km/hr.

So that is not exceeding the 135km/h speed limit.

There's a really quick conversion. Just remember there are 3600 secs. in 1 hr., so use a factor of 3.6.

(23 x 3.6) = 82.8 kph. Well under the speed limit.

You can also use 3.6 to convert from kph to m/sec by dividing kph by 3.6.

Easy?

23m/s= 82.80000kph

m/s -> kph

kph =

m/s * 3.600000

kph =

23 * 3.600000

kph =

82.80000

1km = 1000 metres

1 hour = 3600 seconds

so 23*3600/1000

Cars can't go that fast.

133,253 km/hr