Question

What is the speed of an object that travels from `( 8 , 2,6 )` to `( 5 , -4 ,1 )` over `2 s`?

Answer 1

`4.18"units/s"`

Explanation:

The distance between the points is given by:

`d=sqrt((8-5)^2+(2-(-4))^2+(6-1)^2`

`:.d=sqrt(3^2+6^2+5^2)=sqrt(70)=8.36"units"`

So the speed will be:

`v=d/t=8.36/2=4.18"units/s"`