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

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(52776) (Show Source): You can put this solution on YOUR website!
.
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 = = = 4500 joules.

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

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