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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 rebound at an angle '2 = 41° from the neutron's initial direction. The neutron's initial speed is 5.2 105 m/s.
Determine the angle at which the neutron rebounds, '1, measured from its initial direction.
___°
What is the speed of the neutron after the collision?
____ m/s
What is the speed of the helium nucleus after the collision?
____m/s
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