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A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times...

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to move off at an angle θ′2=45∘. The neutron's initial speed is 6.6×105 m/s .

the angle of the neutron after the collision: 76 below the initial direction of the neutron

Determine the speeds of the two particles, v′n and v′He, after the collision.

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