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## Homework Statement

A magnet is moving with constant velocity vector ##\vec V##. A charged particle fly through it. At first, the objects are place very far from each other, and the charged particle velocity vector is ##\vec V0##, after the charged particle cross over and fly away from the magnet, it velocity vector is ##\vec Vc##. We know all the velocity ##\vec V0=110m/s## and ##\vec Vc=134m/s##. The angles are ##|\vec V;\vec V0|=120°## and ##|\vec V;\vec Vc|=45°##. Find ##|\vec V|##

Note: Assume that the charged particle do not affect the motion and magnetic properties of the magnet.

## Homework Equations

3. The Attempt at a Solution [/B]

It must be some kind of momentum and angular momentum conservation, since we have no information about the magnetic field created by the magnet and the charge of the charged particles, nor do it mass. I assume a elastic collision between the charged particle and the magnet, but that do not hold since we cannot explain the velocity change in the direction perpendicular to ##\vec V##. I have no idea how to apply angular momentum conservation.