Question 1066911
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Kinetic energy varies jointly as the mass and the square of the velocity. A mass of 10 grams and velocity of 5 centimeters per second 
has a kinetic energy of 50 ergs. Find the kinetic energy for a mass of 5 grams and velocity of 9 centimeters per second.
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From the Wikipedia article <A HREF=https://en.wikipedia.org/wiki/Erg>https://en.wikipedia.org/wiki/Erg</A>


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       The erg is a unit of energy and work equal to 10&#8722;7 joules. It originated in the centimetre–gram–second (CGS) system of units. 
       It has the symbol erg. The erg is not an SI unit. The erg is a unit of energy and work equal to {{{10^(-7)}}} joules. 
       It originated in the centimetre–gram–second (CGS) system of units. It has the symbol erg. The erg is not an SI unit.
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<pre>
Kinetic energy of the body which has the mass "m" and the velocity "v" is E = {{{mv^2/2}}}.

Substitute the given data to get the kinetic energy value  E = {{{(10*5^2)/2}}} = 125 erg.
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