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

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Answer 1 · 2017-07-10T05:54:43

The average speed is $=6.15ms^-1$
The average velocity is $=0ms^-1$

The total distance travelled is $d=5*8+8*5=80m$

The total time is $t=8+5=13s$

The average speed is

$barv=d/t=80/13=6.15ms^-1$

The displacement is

$Deltax=5*8-8*5=0m$

The average velocity is

$=(Deltax)/t=0/13=0ms^-1$

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 5 s5 s. What are the object's average speed and velocity?