An object travels North at $2 m/s$ for $6 s$ and then travels South at $7 m/s$ for $9 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-08-14T06:42:50

The average speed is $=5ms^-1$
The average velocity is $=3.4ms^-1$

The total distance travelled is $d=(2*6)+(7*9)=12+63=75m$

The total time is $t=6+9=15s$

The average speed is

$barv=d/t=75/15=5ms^-1$

The displacement is

$Deltax=(2*6)-(7*9)=12-63=-51m$

The average velocity is

$=(Deltax)/t=|-51|/15=3.4ms^-1$

An object travels North at 2 m/s 2 m/s for 6 s6 s and then travels South at 7 m/s 7 m/s for 9 s 9 s. What are the object's average speed and velocity?