Uniform motion: constant velocity
This is the simplest kind of motion.
It only depends on time and velocity.
Examples
1) If you travel from Brighton to London (50 miles) in 1 hour, what is your (average) velocity?
v = 50 miles / 1 hour = 50 miles / hour
2) If I travel at 100 miles an hour for 3 hours, how far do I get?
Δs = 100 * 3 = 300 miles
Converting miles per hour into m / s :
We normally must work using SI untis, which in thi case are m and s.
It is then necessary to know how to convert from more usual speed units, like km/h or mph, to m/s. Here is how to do:
-Converting km/h (kilometers per hour) to m /s (meters per second):
we know that 1 km = 1000m and that 1 hour = 3600 s, so:
1 km / h = 1000 m / 3600 s = 0.28 m/s
so: 1 m/s = 3.6 km / h
-Converting mph (miles per hour) to m/s (meters per second):
1 mile/ h = 1600 m / 3600 s = 0.44 m / s
3) Convert 100 mph into m/s.
1 mph = 0.44 m/s
100 mph = 44 m/s
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