Finding Speed of Neutron after Decay

[bob dobilina]

KE of He5 would be 0 since the problems states it at rest before the reaction.
KE of He4 is given to us.
KE of Neutron could be found using KE=mv²/2. The mass is given to us in the question, and we already found velocity.
Ok, so what do i do when I found the KE? Am i going to be using E=mc²?

 

[haruspex]

KE of He5 would be 0 since the problems states it at rest before the reaction.
KE of He4 is given to us.
KE of Neutron could be found using KE=mv²/2. The mass is given to us in the question, and we already found velocity.
Ok, so what do i do when I found the KE? Am i going to be using E=mc²?

Yes.

 

[bob dobilina]

Yes.

Could I use the total kinetic energy to find the mass defect by manipulating e=mc²? If so, once I find the mass defect, can I add that mass to the mass of He4 and the neutron to get the mass of He5?

 

[haruspex]

Could I use the total kinetic energy to find the mass defect by manipulating e=mc²? If so, once I find the mass defect, can I add that mass to the mass of He4 and the neutron to get the mass of He5?

Yes.