An object travels North at $5 m/s$ for $8 s$ and then travels South at $8 m/s$ for $4 s$ . What are the object's average speed and velocity?

Question

1437 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2017-08-05T18:57:26

The average speed is $=6ms^-1$
The average velocity is $=0.67ms^-1$

The total distance travelled is $d=(5*8)+(8*4)=40+32=72m$

The total time is $t=8+4=12s$

The average speed is

$barv=d/t=72/12=6ms^-1$

The displacement is

$Deltax=(5*8)-(8*4)=40-32=8m$

The average velocity is

$=(Deltax)/t=8/12=0.67ms^-1$

An object travels North at 5 m/s5 m/s for 8 s8 s and then travels South at 8 m/s8 m/s for 4 s4 s. What are the object's average speed and velocity?