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A proton moving with a velocity of 10^(6...

A proton moving with a velocity of `10^(6) m//s` collides with a neutron at rest. If collision is prefectliy elastic, then after collsion, what are the velocities of porton and neutron?

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As mass of porton and neutron are (almost) equel, therefore on perfectly elastic collsion between then. Their velocities are exchange, i.e., velocity of neutron `=10^(6) m//s`, and
velocity of porton=zero.
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