An object travels North at $5 m/s$ for $8 s$ and then travels South at $4 m/s$ for $2 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-08-05T06:38:17

The average speed is $=4.8ms^-1$
The average velocity is $=3.2ms^-1$

The total distance travelled is $d=5*8+4*2=40+8=48m$

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

The average speed is

$barv=d/t=48/10=4.8ms^-1$

The displacement is

$Deltax=5*8-4*2=40-8=32m$

The average velocity is

$=(Deltax)/t=32/10=3.2ms^-1$

An object travels North at 5 m/s5 m/s for 8 s8 s and then travels South at 4 m/s4 m/s for 2 s 2 s. What are the object's average speed and velocity?