Whe helium nucleus is seen to move off at and angle of, Ask an Expert

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A neutorn taveling at a speed fo 6.2 x 105m/s collides elastically with a heium mucleus at rest whose mass is 4x the neutron. whe helium nucleus is seen to move off at and angle of theta= -45 after the collision. Determine the angle of the neutron and the final speeds of each particle after collision.

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