A proton traveling at $42.0^{\circ}$ with respect to the direction of a magnetic field of strength $2.60 \mathrm{mT}$ experiences a magnetic force of $1.17 \times 10^{-17} \mathrm{~N}$. Calculate (a) the proton's speed, (b) its kinetic energy in electron-volts, and (c) its momentum.