A proton moves along the x-axis and enters a region of uniform magnetic field, where the field points along the positive z-axis. The magnetic field boundary is perpendicular to the x-axis, and the proton exits d = 3.5 mm away from the point of entry 7.5 ms later. Another proton enters the same region and exits a distance of 6.5 mm away from the point of entry. Find the speed of the first proton. Number m/s. Find the magnetic field. Number T. How much time does the second proton take to exit the field? Number s