An object travels North at $2 m/s$ for $7 s$ and then travels South at $4 m/s$ for $4 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-09-15T05:06:35

The average speed is $=2.73ms^-1$
The average velocity is $=0.18ms^-1$

The total distance travelled is $d=(2*7)+(4*4)=14+16=30m$

The total time is $t=7+4=11s$

The average speed is

$barv=d/t=30/11=2.73ms^-1$

The displacement is

$Deltax=(2*7)-(4*4)=14-16=-2m$

The average velocity is

$=(Deltax)/t=|-2|/11=0.18ms^-1$

An object travels North at 2 m/s 2 m/s for 7 s7 s and then travels South at 4 m/s 4 m/s for 4 s 4 s. What are the object's average speed and velocity?