Remember: Average speed= distance/time
Average velocity = displacement/time
For each one of the following cases, find the average speed and average velocity, both in m/s
1.
Moving 50m east then
70mwest in 2 minutes.
Average Speed = 120meters/2minutes
= 60meters/minute = 1m/s
Average Velocity =
20meters/2minutes = 10meters/minute = .17m/s west
2.
Moving north 60m, south 80m
and north again 10m in 4.5minutes.
Average Speed =
150meters/4.5minutes = 33.33meters/minute = 0.56m/s
Average Velocity = 10meters/4.5minutes
= 2.22meters/minute = .04m/s south
3.
Moving 60 m east in 2 hours
Average Speed =
60meters/2hours = 30meters/hour = .008m/s
Average Velocity =
60meters/2hours = 30meters/hour = .008m/s east
4.
Moving north 50m then east
20m in 1.5 minutes
Average Speed = 70meters/1.5minutes
= 46.7meters/minute = .78m/s
Average Velocity = 53.85meters/1.5minutes
= 35.9meters/minute = .6/s 21.8 degrees northeast
5.
Moving east 30m, west 20m
then south 70m in 2 minutes.
Average Speed = 120meters/2minutes
= 60meters/minute = 1m/s
Average Velocity = 70.71meters/2minutes
= 35.36meters/minute = .59m/s 81.9 degrees southeast
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