A U-238 Nucleus (Mass = 238 Units) Decays, Transforming into an Alpha

A U-238 nucleus (mass = 238 units) decays, transforming into an alpha particle (mass = 4.00 units) and a residual thorium nucleus (mass = 234 units). If the uranium nucleus was at rest, and the alpha particle has a speed of 1.50 × 10⁷ m/s, determine the recoil speed of the thorium nucleus.

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