An object travels North at $1 m/s$ for $3 s$ and then travels South at $2 m/s$ for $7 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-07-10T14:13:06

The average speed is $=1.7ms^-1$
The average velocity is $=1.1ms^-1$

The total distance travelled is $d=1*3+2*7=17m$

The total time is $t=3+7=10s$

The average speed is

$barv=d/t=17/10=1.7ms^-1$

The displacement is

$Deltax=2*7-1*3=11m$

The average velocity is

$=(Deltax)/t=11/10=1.1ms^-1$

An object travels North at 1 m/s1 m/s for 3 s3 s and then travels South at 2 m/s2 m/s for 7 s7 s. What are the object's average speed and velocity?