Chapter 24, Problem 54P

GO A positron (charge +e, mass equal to the electron mass) is moving at 1.0 × 10⁷ m/s in the positive direction of an x axis when, at x = 0, it encounters an electric field directed along the x axis. The electric potential V associated with the field is given in Fig. 24-57. The scale of the vertical axis is set by V_s = 500.0 V. (a) Does the positron emerge from the field at x = 0 (which means its motion is reversed) or at x = 0.50 m (which means its motion is not reversed)? (b) What is its speed when it emerges?

Figure 24-57 Problem 54.