SOLUTION: The kinetic energy K of a moving object varies jointly with its mass m and the square of its velocity v. If an object weighing 40 kilograms with a velocity of 15 meters per second

Algebra ->  Rational-functions -> SOLUTION: The kinetic energy K of a moving object varies jointly with its mass m and the square of its velocity v. If an object weighing 40 kilograms with a velocity of 15 meters per second       Log On


   

Question 1137141: The kinetic energy K of a moving object varies jointly with its mass m and the square of its velocity v. If an object weighing 40 kilograms with a velocity of 15 meters per second has a kinetic energy of 1000 joules, what is the kinetic energy if the velocity is increased to 20 meters per second?

Answer by ikleyn(52775) About Me  (Show Source):
You can put this solution on YOUR website!
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This post consists of three sentences.


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


The second sentence 
    "If an object weighing  40  kilograms with a velocity of 15 meters per second has a kinetic energy of  1000  joules"

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

but   E = %28mv%5E2%29%2F2 = %2840%2A15%5E2%29%2F2 = 4500 joules.


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