# What is the kinetic energy of a 16 kg object moving at 4 m/s?

Mar 9, 2018

128 joules

#### Explanation:

kinetic energy=$\frac{1}{2} \times m a s s \times {\left(v e l o c i t y\right)}^{2}$
thus,$\frac{1}{2} \times 16 \times 16 \mathmr{and} 128 \text{ joules}$ is the kinetic energy of the body

Mar 10, 2018

$128$ joules

#### Explanation:

The kinetic energy of an object is expressed through the equation:

$\text{KE} = \frac{1}{2} m {v}^{2}$

where $m$ is the mass of the object in kilograms, $v$ is the velocity of the object in meters per second.

We got: $m = 16 \setminus \text{kg", v=4 \ "m/s}$

So, plugging in the values into the equation, we get

"KE"=1/2*16 \ "kg"*(4 \ "m/s")^2

$= 8 \setminus {\text{kg"*16 \ "m"^2"/s}}^{2}$

$= 128 \setminus {\text{kg m"^2 \ "s}}^{2}$

Know that $1 \setminus \text{kg m"^2 \ "s"^2=1 \ "J}$.

So, we got $128 \setminus \text{J}$ of kinetic energy, i.e. the object's kinetic energy is $128$ joules.