Question

What is the kinetic energy in joules?

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

Answer 1

See below

Explanation:

`K.E= 1/2 * m * v^2`

`m` is the mass
`v` is the velocity

`m` = 6
`v` = 4

`therefore K.E = 1/2 * 6 * 4^2 = 48 J`

`therefore 48` joules

Answer 2

`48 \ "J"`

Explanation:

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

`KE=1/2mv^2`

`m` is the mass of the object in `"kg"`

`v` is the velocity in `"m/s"`

We have: `m=6 \ "kg"`, `v=4 \ "m/s"`

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

`=1/2*6 \ "kg"*16 \ "m"^2"/s"^2`

`=48 \ "kg" \ "m"^2"/s"^2`

`=48 \ "J"`