An object travels North at $9 m/s$ for $5 s$ and then travels South at $7 m/s$ for $3 s$ . What are the object's average speed and velocity?

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Answer 1 · 2016-12-11T13:40:26

Average Speed: $8.25$ m/s
Average Velocity: $3$ m/s North

$9 m/s N$ for $5$ s
$rarr$ distance traveled: $45 m$ ; displacement: $45 m N$

$7 m/s S$ for $3$ s
$rarr$ distance traveled: $21 m$ ; displacement: $21 m S$

Total Distance traveled for $8$ s: $45+21 m =66 m$
Average Speed: $66 m$ / $8 s=8.25 m"/"s$

Total Displacement after $8$ s: $45 mN-21mS=24mN$
Average Velocity: $24 m N"/"8 s=3m"/"s N$

An object travels North at 9 m/s9 m/s for 5 s5 s and then travels South at 7 m/s7 m/s for 3 s 3 s. What are the object's average speed and velocity?