Objects $$ and $$ are both positively charged. Both have a mass of $100$ g$,$ but $$ has twice the charge of

$.$ When $$ and $$ are placed $10$ cm apart, $$ experiences an electric force of $0\mathrm{.}45$ N$.$ What is the charge

on $?$ If the objects are released, what is the initial acceleration of $?($ANS: $1\mathrm{.}0$C$,4\mathrm{.}5$ m s$2)$