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January 30, 2015

January 30, 2015

Posted by **Vinitha** on Monday, June 11, 2012 at 4:06am.

- math -
**MathMate**, Monday, June 11, 2012 at 6:39amKinetic energy at velocity v

Ek(v)=Kv²

Since

Ek(20)-Ek(15)=10 j = K(20²-15²)=175K

we solve for K to get

K=10/175

Ek(12)=(10/175)*12² j

=8.2 j.

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