An object travels North at $8 m/s$ for $7 s$ and then travels South at $3 m/s$ for $9 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-12-15T07:50:41

The average speed is $=5.1875ms^-1$ . The average velocity is $=1.8125ms^-1$

Total distance travelled is $d=(8xx7)+(3xx9)=56+27=83$

Total time is $t=7+9=16s$

The average speed is

$barv=d/t=83/16=5.1875ms^-1$

The distance from the starting point is

$d_1=(8xx7)-(3xx9)=56-27=29m$

The time is the same

The average velocity is

$=29/16=1.8125ms^-1$

An object travels North at 8 m/s8 m/s for 7 s7 s and then travels South at 3 m/s3 m/s for 9 s9 s. What are the object's average speed and velocity?