s = = xtxt 20 m 4 s s = 5 m/s Not direction dependent! A B x = 20 m Time t = 4 s.

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Presentation transcript:

s = = xtxt 20 m 4 s s = 5 m/s Not direction dependent! A B x = 20 m Time t = 4 s

v = 3 m/s at 20 0 N of E Direction required! A B s = 20 m Time t = 4 s d= 12 m 20 o

Recall that average speed is a function only of total distance and total time: Total distance= 200 m m = 500 m Avg. speed 8.33 m/s Direction does not matter! start x 1 = 200 mx 2 = 300 m

x o = 0 t = 60 s x 1 = +200 mx f = -100 m x 0 = 0 m; x f = = -100 m Direction of final displacement is to the left as shown. Average velocity: Note: Average velocity is directed to the west.

Instantaneous speed:  the speed at any given instant in time. Average speed:  the average of all instantaneous speeds; found simply by a distance/time ratio. Instantaneous speed:  the speed at any given instant in time. Average speed:  the average of all instantaneous speeds; found simply by a distance/time ratio.