5.5 Exercise 27

A particle of mass m and charge $− q$ moves along a straight line away from a fixed particle of charge Q. When the distance between the two particles is $r_{0} , − q$ is moving with a speed $v_{0} .$ (a) Use the work-energy theorem to calculate the maximum separation of the charges. (b) What do you have to assume about $v_{0}$ to make this calculation? (c) What is the minimum value of $v_{0}$ such that $− q$ escapes from Q?