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

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Answer 1 · 2017-06-17T05:50:19

The average speed is $=3.27ms^-1$
The average velocity is $=1.82ms^-1$

The average speed is $=$ total distance $/$ time,

The total distance is $d=(4*7)+(2*4)=36m$

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

The average speed is $=d/t=36/11=3.27ms^-1$

The average velocity is $=$ displacement $/time$

$barv=(Deltax)/(t)=(7*4-2*4)/(7+4)=20/11=1.82ms^-1$

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