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 s3s?

1 Answer
Feb 5, 2018

5.09ms^(-1)5.09ms1

Explanation:

"Speed"="Distance"/"Time"Speed=DistanceTime

"Time"=3sTime=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)