Velocity and Speed
- Speed is equal to distance traveled divided by time taken
- Velocity is equal to displacement divided by time taken.
- Velocity is speed with a direction. If we calculate an object velocity, we have to think about its direction too.
Calculating the speed
The way to calculating speed is
v = d : t
or
d = v x t
- The unit of distance in SI is meter, and the Unit of time is second; therefore the unit of speed is meter per second (m / s).
- The difference between velocity & speed is only in direction. The unit of velocity is same as speed, m / s
The Question of Speed
- An athlete made his world record of 10 km within 20 minutes. What was his speed?
Solution:
Known:
Distance, d = 10 km = 10.000 m
Time,
t = 20 minutes = 1200
Asked:
speed, v = ? use equation v = d / t
Result:
v = d / t = (10.000 m) / (1200 s) = 8.33 m / s
v = d / t = (10.000 m) / (1200 s) = 8.33 m / s
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