A proton having an initial velocity of 17.2i hat bold Mm/s enters a uniform magnetic field of magnitude 0.360 T with a direction perpendicular to the proton's velocity. It leaves the field-filled region with velocity -17.2j hat bold Mm/s.
(a) Determine the distance the proton traveled in the field.
___________ m
(b) Determine the time interval for which the proton is in the field.
___________ns