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 90 kilograms and moving with a velocity of 20 m

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Question 263223: 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 90 kilograms and moving with a velocity of 20 meters per second has a kinetic energy of 4500 Joules, find its kinetic energy when the velocity is 32 meters per second.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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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 90 kilograms and moving with a velocity of 20 meters per second has a kinetic energy of 4500 Joules, find its kinetic energy when the velocity is 32 meters per second.
:
The mass is the same in both cases so can't we just:
20%5E2%2F32%5E2 = 4500%2Fx
400x = 4608000
x = 4608000%2F400
x = 11,520 joules