An object travels North at $6 m/s$ for $2 s$ and then travels South at $2 m/s$ for $8 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-08-08T06:11:06

The average speed is $=2.8ms^-1$
The average velocity is $=0.4ms^-1$

The total distance travelled is $d=(6*2)+(2*8)=12+16=28m$

The total time is $t=2+8=10s$

The average speed is

$barv=d/t=28/10=2.8ms^-1$

The displacement is

$Deltax=(6*2)-(2*8)=12-16=-4m$

The average velocity is

$=(Deltax)/t=4/10=0.4ms^-1$

An object travels North at 6 m/s6 m/s for 2 s2 s and then travels South at 2 m/s2 m/s for 8 s8 s. What are the object's average speed and velocity?