Chapter 28, Problem 6P

GO A proton moves through a uniform magnetic field given by = (10 – 20 + 30) mT. At time t_, the proton has a velocity given by = ѵ_{x+ ѵy + (2.0 km/s) and the magnetic force of the proton is = (4.0 02 × 10⁻¹⁷ N)+ (2.0 × 10⁻¹⁷ N). At that instant, what are (a) ѵx and (b) ѵy?}