At a given instant, a particle with a mass of 5.00 x 10-3 kg and a charge of 3.50 x 10-8 C has a velocity with a magnitude of 2.00 x 105 m/s in the +y direction. It is moving in a uniform magnetic field that has magnitude of 0.8 T and is in the -x direction. What are (a) the magnitude and direction of the magnetic force on the particle and (b) its resulting acceleration?