An object travels North at $3 m/s$ for $1 s$ 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 · 2017-06-09T14:39:04

The average speed is $=2.125ms^-1$
The average velocity is $=-1.375ms^-1$

The average speed is $=$ total distance $/$ time,

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

The total time is $t=1+7=8s$

The average speed is $=d/t=17/8=2.125ms^-1$

The average velocity is

$barv=(Deltax)/(Deltat)=(3*1-2*7)/(1+7)=-11/8=-1.375ms^-1$

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