In order to find the recoil velocity of a spring

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To find the recoil velocity of the Po-214 nucleus after alpha decay, conservation of momentum and energy principles must be applied. The alpha particle, with a mass of 6.65×10−27 kg and kinetic energy of 1.16×10−12 J, is emitted, resulting in a recoil of the remaining nucleus. The mass of the Po-214 nucleus is approximately 214 amu, which translates to about 3.55×10−25 kg. Calculating the recoil velocity involves using the relationship between kinetic energy and momentum. Accurate values for the masses of both the alpha particle and the Po-214 nucleus are essential for the calculations.
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The nucleus of Po^214 decays radioactively by emitting an alpha particle (mass 6.65×10−27 kg) with kinetic energy 1.16×10−12 J, as measured in the laboratory reference frame.

a) Assuming that the Po was initially at rest in this frame, find the magnitude of the recoil velocity of the nucleus that remains after the decay.

in order to find the recoil velocity... i have tried v=-(sqrt KE*2m)/m ... is there a known mass for Polonium that you plug into this problem? where am i going wrong?
 
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