A stationary \( U^{238} \) nucleus emits an \( \alpha \)-particle \( \left({ }_{2} \mathrm{He}^{...

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A stationary \( U^{238} \) nucleus emits an \( \alpha \)-particle \( \left({ }_{2} \mathrm{He}^{4}\right) \) with velocity \( 1.4 \times 10^{7} \mathrm{~m} / \mathrm{s} \) and kinetic energy \( 4.1 \mathrm{MeV} \). Calculate the velocity of the residual nucleus.
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