NASA's Deep Space 1 and Dawn spacecraft employed ion thrusters in which xenon ions with a charge

Question:

NASA's Deep Space 1 and Dawn spacecraft employed ion thrusters in which xenon ions with a charge of +1.60 × 10-19 C and a mass of 2.18 × 10-25 kg are accelerated through a potential difference of 1315 V. What is the speed of the xenon ions as they exit the thruster?