Moving Charges and Magnetism

Question: A uniform magnetic field B is acting from south to north and is of magnitude 1.5 $Wb/{m^2}$. If a proton having mass $ = 1.7 \times {10^{ - 27}}\,kg$ and charge $ = 1.6 \times {10^{ - 19}}\,C$ moves in this field vertically downwards with energy 5 MeV, then the force acting on it will be