separation is $3\mathrm{.}88cm.$ At the same moment, both particles are released.

$($a$)$ Calculate the distance $($in $cm)$ from the positive plate at which the two pass each other. Ignore the electrical attraction between the proton and electron.

$cm$

$($b$)$ Repeat part $($a$)$ for a sodium ion $(N{a}^{+})$and a chloride ion $(C{l}^{-}).($Give your answer in $cm.)$

$cm$