Four particles of mass 1 Kg each, are moving on a plane with the velocities given in the figure.
The Attempt at a Solution
First I calculated the position of the CoM:
Xcm=7/4(i + j)
Then I calculated the velocity of the CoM:
Vcm= ½i + ¼j
For the internal energy I did the following:
Kint= (1/2)(1.52) + (1/2)(1.32) + (1/2)(1.32) + (1/2)(1.22) = 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.