An object travels North at $8 m/s$ for $9 s$ and then travels South at $4 m/s$ for $3 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-07-14T05:25:40

The average speed is $=7ms^-1$
The average velocity is $=5ms^-1$

The total distance travelled is $d=8*9+4*3=84m$

The total time is $t=9+3=12s$

The average speed is

$barv=d/t=84/12=7ms^-1$

The displacement is

$Deltax=8*9-4*3=60m$

The average velocity is

$=(Deltax)/t=60/12=5ms^-1$

An object travels North at 8 m/s8 m/s for 9 s9 s and then travels South at 4 m/s4 m/s for 3 s3 s. What are the object's average speed and velocity?