What is the speed of an object that travels from #( 2,1,2) # to #( 3, 0,7 ) # over #3 s#?
1 Answer
Jan 17, 2016
The speed of the object
Explanation:
 If you take the two points as standard form vectors, the distance between them would be the magnitude of the vector of their difference.
So take

#vec(AB)=<1,1,9>#
#AB=sqrt(1^2+1^2+9^2)#
#AB=sqrt(83)=9.110#
#"distance"=9.110# 
The speed of the object
#="distance"/"time"#
#=9.110/3=3.037 " units/s"#