3.6 Exercise 14

An electron is moving in a straight line with a velocity of $4.0 \times 10^{5}$ m/s. It enters a region 5.0 cm long where it undergoes an acceleration of $6.0 \times 10^{12} \text{m}/\text{s}^{2}$ along the same straight line. (a) What is the electron’s velocity when it emerges from this region? b) How long does the electron take to cross the region?