# What is the speed of an object that travels from ( -4,6,1)  to ( 9,3,7 )  over 2 s?

Jun 21, 2018

The speed is $= 7.31 m {s}^{-} 1$

#### Explanation:

The speed is

$v = \frac{d}{t}$

The distance is

$d = \sqrt{{\left(9 - \left(- 4\right)\right)}^{2} + {\left(3 - 6\right)}^{2} + {\left(7 - 1\right)}^{2}}$

$= \sqrt{{13}^{2} + {3}^{2} + {6}^{2}}$

$= \sqrt{214}$

$= 14.63 m$

The speed is

$v = \frac{14.63}{2} = 7.31 m {s}^{-} 1$