With what speed v did the particle enter the region containing the magnetic field?

A charged particle of mass m = 4.8 x 10−8 kg, moving with constant velocity in the y-direction enters a region containing a constant magnetic field B = 3.9 T aligned with the positive z-axis. The particle enters the region at (x,y) = (0.67 m, 0) and leaves the region at (x,y) = (0, 0.67) m a time t = 823 μs after it entered the region.

  1. With what speed v did the particle enter the region containing the magnetic field?
  2. What is Fx, the x-component of the force on the particle at a time t1 = 274.3 μs after it entered the region containing the magnetic field.
  3. What is Fy, the y-component of the force on the particle at a time t1 = 274.3 μs after it entered the region containing the magnetic field.
  4. What is q, the charge of the particle? Be sure to include the correct sign.