In a Television Tube, an Electron (Mass 9

Multiple Choice

In a television tube, an electron (mass 9.1 * 10^-31 kg) starting from rest experiences a force of 4.8 *10^-15 N over a distance of 45 cm. Ignoring relativistic effects, the final speed of the electron is

A) 4.7 *10¹⁵ m/s.
B) 2.3 * 10⁷ m/s.
C) 4.9* 10⁷ m/s.
D) 6.9 * 10⁷ m/s.
E) 4.7 * 10^-15 m/s.