What is the velocity ms of a doubly protonated ion with a mz

What is the velocity (m/s) of a doubly protonated ion with a m/z ration of 324.9, which has been accelerated to a kinetic energy of 0.75 MeV? what is the radius of curvature for this ion, when it experiences a homogeneous magnetic field of 7T?

what are the flight times of the signally-and doubly protonated ion forms of a 1735.4 Da peptide accelerated by a potential of 25.00 kV in a 1.250 m flight tube?

Solution

KE= 0.75eV= 1.2*10^-19 J m/z=324.9 m= 324.9*2*1.6*10^-19= 1.039*10^-16kg v= sqrt(2KE/m)= 0.048 m/s R= mv/zB= 324.9*0.048/7= 2.227 m