An object travels North at $12 m/s$ for $1 s$ and then travels South at $5 m/s$ for $7 s$ . What are the object's average speed and velocity?

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Answer 1 · 2016-04-25T11:29:39

Average speed $5 7/8 m/s$
Average velocity $2 7/8 m/s "South"$

Distance traveled $= 12 m/sxx1 s + 5 m/sxx7s = 47 m$
Total time $= 1 s+7 s= 8 s$
Average speed $= (47m)/(8s) =5 7/8 m/s$

Displacement $= 12 m "North" + 35 m "South" = -12 m "South" +35 m "South" = 23 m "South"$
Average velocity $= (23m)/(8s)= 2 7/8 m/s "South"$

An object travels North at 12 m/s 12 m/s for 1 s1 s and then travels South at 5 m/s 5 m/s for 7 s 7 s. What are the object's average speed and velocity?