An object travels North at $7 m/s$ for $3 s$ and then travels South at $1 m/s$ for $6 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-08-05T20:10:23

The average speed is $=3ms^-1$
The average velocity is $=1.67ms^-1$

The total distance travelled is $d=(7*3)+(1*6)=21+6=27m$

The total time is $t=3+6=9s$

The average speed is

$barv=d/t=27/9=3ms^-1$

The displacement is

$Deltax=(7*3)-(1*6)=21-6=15m$

The average velocity is

$=(Deltax)/t=15/9=1.67ms^-1$

An object travels North at 7 m/s 7 m/s for 3 s3 s and then travels South at 1 m/s1 m/s for 6 s 6 s. What are the object's average speed and velocity?