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two putty balls, one of mass M and the other of mass 2M, collide and stick...

two putty balls, one of mass M and the other of mass 2M, collide and stick together. just before the collision, the ball with mass 2m is moving at an angle theta, with respect to the +y direction with speed V, and ball with mass M is moving in the +x direction with speed 2V. (derive and expression using the coordinate system provided, in terms of system parameters, for the KE of the combined object after collision.?)

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