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Homework Statement
Four particles of mass 1 Kg each, are moving on a plane with the velocities given in the figure.
Homework Equations
The Attempt at a Solution
First I calculated the position of the CoM:
X_{cm}=7/4(i + j)
Then I calculated the velocity of the CoM:
V_{cm}= ½i + ¼j
For the internal energy I did the following:
K_{int}= (1/2)(1.5^{2}) + (1/2)(1.3^{2}) + (1/2)(1.3^{2}) + (1/2)(1.2^{2}) = 23,5J
But the answer is 22,9 J. And for the internal angular momentum I do not actually know with respect to which point I should calculate it. Any hint would be appreciated. Thank you.
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