Question 1137141
.
This post consists of three sentences.



The first sentence

<pre>
    "The kinetic energy K of a moving object varies jointly with its mass m and the square of its velocity v."
</pre>is correct and makes sense.



The second sentence

<pre>
    "If an object weighing &nbsp;40 &nbsp;kilograms with a velocity of 15 meters per second has a kinetic energy of &nbsp;1000 &nbsp;joules"
</pre>

is totally wrong, since the described object under the described condition has kinetic energy &nbsp;NOT &nbsp;&nbsp;1000 &nbsp;joules, 


but &nbsp;&nbsp;E = {{{(mv^2)/2}}} = {{{(40*15^2)/2}}} = 4500 joules.



It is clear from the post that its author is absolutely not familiar with the subject.