A proton moves through a uniform magnetic field given by B $=(15\mathrm{.}025\mathrm{.}4+12\mathrm{.}7$k$)$ mT$.$ At time t$1,$ the proton has a velocity given by $=$ v $+$ v$+(1\mathrm{.}94$ km$/$s$)$ and the magnetic force on the proton is

FB$=$

$=(5\mathrm{.}331017$ N$)+(3\mathrm{.}1510-17$ N$)\}.($a$)$ At that instant, what is v$?($b$)$ At that instant, what is vy$?$