An object travels North at $8 m/s$ for $8 s$ and then travels South at $3 m/s$ for $2 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-10-06T05:48:36

The average speed is $=7ms^-1$
The average velocity is $=5.8ms^-1$

The total distance travelled is $d=(8*8)+(3*2)=64+6=70m$

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

The average speed is

$barv=d/t=70/10=7ms^-1$

The displacement is

$Deltax=(8*8)-(3*2)=64-6=58m$

The average velocity is

$=(Deltax)/t=|58|/10=5.8ms^-1$

An object travels North at 8 m/s 8 m/s for 8 s8 s and then travels South at 3 m/s 3 m/s for 2 s 2 s. What are the object's average speed and velocity?