The figure shows a graph for electric potential versus position along the x -axi

Question

The figure shows a graph for electric potential versus position along the x-axis. An electron is originally at point A, moving in the positive x-direction. How much kinetic energy does it need to have at point A in order to be able to reach point E (with no forces acting on the electron other than those due to the indicated potential)? Points B, C, and D have to be passed on the way.

The figure shows a graph for electric potential versus position along the x-axis. An electron is originally at point A, moving in the positive x-direction. How much kinetic energy does it need to have at point A in order to be able to reach point E (with no forces acting on the electron other than those due to the indicated potential)? Points B, C, and D have to be passed on the way.

Explanation / Answer

(-100 V) (1.6e-19) = -1.6e-17
(60 V)(1.6e-19) = +9.6 e -18
(-40 V) (1.6 e -19) = -6.4 e -18
(-20 V)(1.6 e -19) =-3.2e-18
(55 V)(1.6 e -19)= +8.8e -18

And then I added them all together for the answer + or - 7.2e-18

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