A U-238 Nucleus (Mass = 238 Units)decays,transforming into an Alpha

Short Answer

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.