Question

What is the speed of an object that travels from `( 8,-4,2)` to `( 7,-3,6 )` over `3 s`?

Answer 1

`v=sqrt 2 m/s`

Explanation:

`"Distance the point (8,-4,2) and (7,-3,6) may be calculated using:"`
`Delta x=sqrt((7-8)^2+(-3+4)^2+(6-2)^2)=sqrt(1+1+16)=sqrt 18 m`
`"The speed of an object is given by :"v=(Delta x)/t`
`v=sqrt 18/3`
`v=sqrt (9*2)/3`
`v=3*sqrt 2/3`
`v=sqrt 2 m/s`