Question

What is the speed of an object that travels from `( 1,-4,6)` to `( 0,-9,2)` over `3 s`?

Answer 1

`v=sqrt42/3 " "m/s`

Explanation:

`"distance between the given points is: "Delta s=sqrt(1^2+5^2+4^2)`
`Delta s=sqrt(1+25+16)=sqrt 42 " units"`
`v=(Delta s)/(Delta t)`
`v=sqrt42/3 " "m/s`