Problem: A moving electron has kinetic energy K1 . After a net amount of work W has been done on it, the electron is moving one-quarter as fast in the opposite direction.Find W in terms of K1 .Does your answer depend on the final direction of the electrons motion?

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A moving electron has kinetic energy K1 . After a net amount of work W has been done on it, the electron is moving one-quarter as fast in the opposite direction.

Find W in terms of K1 .

Does your answer depend on the final direction of the electrons motion?