Question

An electron is projected, with an initial speed of v= 2.18e+05 m/sec, directly towards a proton that is essentially at rest. If the electron is initially a great distance from the proton, at what distance from the proton is its speed instantaneously equal to twice its initial value? Express your answer in meters.

Answer 1

See my answer to a similar question below under related questions.
The initial speed is different but the same equation can be used.

Answer 2

Thanks