What is the speed of an object that travels from $( -9,4,-6)$ to $( -9,-9,2)$ over $3 s$ ?

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Answer 1 · 2018-02-05T12:34:44

$5.09ms^(-1)$

$"Speed"="Distance"/"Time"$

$"Time"=3s$

$"Distance"=sqrt((Deltax)^2+(Deltay)^2+(Deltaz)^2)$

$Deltax=-9-(-9)=-9+9=0$
$Deltay=-9-4=-13$
$Deltaz=2-(-6)=2+6=8$

$"Distance"=sqrt(0^2+(-13)^2+8^2)=sqrt(169+64)=sqrt(233)$

$"Speed"=sqrt(233)/3~~5.09ms^(-1)$

What is the speed of an object that travels from ( -9,4,-6) ( -9,4,-6) to ( -9,-9,2) ( -9,-9,2) over 3 s3 s?