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Europa
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Homework Statement
A 500 g billiard ball is going at 10 m/s [E] when it impacts 2 other identical billiard balls. Afterwards, you observe 2 of the balls moving at 2 m/s [30 W of S] and 3 m/s[45 N of E] respectively. Calculate the Energy lost in the collision.
Homework Equations
KE = 1/2mv^2
p = mv
p(initial) = p(final)
Energy lost = final energy - initial energy
The Attempt at a Solution
Since there is some energy lost, this is only a near elastic collision.
Using,p(initial) = p(final), break the initial and final into components.
X: mv1 = mv1f +mv2f
Y: mv1 = mv1f + mv2f
Since the masses are all the same we can cancel them out.
X: 10 = 3cos45 - 2sin30
Y: 0 = 3sin45 - 2cos30
I don't even know what i am solving for, don't i already know every variable in the conservation of momentum equation? (Pretty sure I am a variable or something)