Question

What is the speed of an object that travels from `( -1, 7,2)` to `( -3, -1,0 )` over `2 s`?

Answer 1

`4.24"units/s"`

Explanation:

The distance between the 2 points is given by:

`d=sqrt((-1+3)^2+(7+1)^2+(2-0)^2`

`:.d=sqrt(2^2+8^2+2^2)`

`d=sqrt(72)=8.48"units"`

`:.v=d/t=8.48/2=4.24"units/s"`