A proton is travelling with horizontal velocity

A proton is travelling with horizontal velocity ${ v }{ x }$ = 2.5 x ${{10}^{8}}$cm/s. Calculate the transverse deflection in travelling horizontal distance, x = 5 cm in electric field of
${ E }
{ γ }$ = 400 V/cm, mass of proton, m = 1.6 x ${{10}^{-24}}$ g, charge on proton, e =1.6 x${{10}^{-19}}$ C.