53. A patient is undergoing radiation therapy. A radioactive isotope decays and emits an a particle with an initial velocity of 2×10⁷ m/s. The a particle is slowed down by the Coulomb force from a nearby nucleus, experiencing a deceleration of 5× m/s². How far will the a particle travel before coming to a stop?
(A) 0.1 meters
(B) 0.2 meters
(C) 0.3 meters
(D) 0.4 meters
(E) 0.5 meters

其他試題