In a cathode ray tube, an electron (mass 9.1 x 10-31 kg, charge -1.6 x 10-19 C) is accelerated from rest by a uniform electric field of strength 20 kV m1. How much time does it take to travel 50 cm? A B C 1.1 x 10-18 s. 2.8 x 10-16 g 1.7 x 10-8 s 5.3 x 10-7s D E 3.2 x 10-5 s [2]