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

Jan 2, 2016

$4.18 \text{units/s}$

#### Explanation:

The distance between the points is given by:

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

$\therefore d = \sqrt{{3}^{2} + {6}^{2} + {5}^{2}} = \sqrt{70} = 8.36 \text{units}$

So the speed will be:

$v = \frac{d}{t} = \frac{8.36}{2} = 4.18 \text{units/s}$