Singly ionized $($one electron removed$)$ atoms are accelerated and then passed through a velocity selector consisting of perpendicular electric and magnetic fields. The electric field is $157$ V$/$mV$/$m and the magnetic field is $3\mathrm{.}16102$ TT $.$ The ions next enter a uniform magnetic field of magnitude $1\mathrm{.}73102$ TT that is oriented perpendicular to their velocity.

Part A

How fast are the ions moving when they emerge from the velocity selector?

Express your answer in meters per second.

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m$/$sm$/$s

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Part B

If the radius of the path of the ions in the second magnetic field is $17\mathrm{.}5$ cmcm $,$ what is their mass?

Express your answer in kilograms.