# What is the kinetic energy in joules?

## An object of mass 6kg has a speed of 4m/s and moves a distance of 2m.

Feb 17, 2018

See below

#### Explanation:

$K . E = \frac{1}{2} \cdot m \cdot {v}^{2}$

$m$ is the mass
$v$ is the velocity

$m$ = 6
$v$ = 4

$\therefore K . E = \frac{1}{2} \cdot 6 \cdot {4}^{2} = 48 J$

$\therefore 48$ joules

Feb 18, 2018

$48 \setminus \text{J}$

#### Explanation:

Well, kinetic energy is independent of distance. The equation for kinetic energy is

$K E = \frac{1}{2} m {v}^{2}$

$m$ is the mass of the object in $\text{kg}$

$v$ is the velocity in $\text{m/s}$

We have: $m = 6 \setminus \text{kg}$, $v = 4 \setminus \text{m/s}$

:.KE=1/2*6 \ "kg"*(4 \ "m/s")^2

$= \frac{1}{2} \cdot 6 \setminus {\text{kg"*16 \ "m"^2"/s}}^{2}$

$= 48 \setminus {\text{kg" \ "m"^2"/s}}^{2}$

$= 48 \setminus \text{J}$