An object travels North at $8 m/s$ for $5 s$ and then travels South at $6 m/s$ for $7 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-07-19T15:27:28

The average speed is $=6.83ms^-1$
The average velocity is $=0.17ms^-1$

The total distance travelled is $d=8*5+6*7=82m$

The total time is $t=5+7=12s$

The average speed is

$barv=d/t=82/12=6.83ms^-1$

The displacement is

$Deltax=8*5-6*7=-2m$

The average velocity is

$=(Deltax)/t=2/12=0.17ms^-1$

An object travels North at 8 m/s8 m/s for 5 s5 s and then travels South at 6 m/s6 m/s for 7 s 7 s. What are the object's average speed and velocity?