Question: A moving electron has kinetic energy K,. After a net amount of work W has been done on it, the electron is moving one-quarter as

A moving electron has kinetic energy K,. After a net amount of work W has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) Find W in terms of K.
(b) Does your answer depend on the final direction of the electron's motion?

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