Question

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

Answer 1

128 joules

Explanation:

kinetic energy=`frac{1}2 xx mass xx (velocity)^2`
thus,`frac{1}2 xx 16xx16 or 128" joules"` is the kinetic energy of the body

Answer 2

`128` joules

Explanation:

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

`"KE"=1/2mv^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 \ "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 \ "kg"*16 \ "m"^2"/s"^2`

`=128 \ "kg m"^2 \ "s"^2`

Know that `1 \ "kg m"^2 \ "s"^2=1 \ "J"`.

So, we got `128 \ "J"` of kinetic energy, i.e. the object's kinetic energy is `128` joules.