Question $7$

$2$ pts

A particle $(q=+5\mathrm{.}0C)$ is released from rest when it is $2\mathrm{.}0$ m from a charged particle which is held at rest. After the positively charged particle has moved $1\mathrm{.}0$ m toward the fixed particle, it has a kinetic energy of $50$ mJ $.$ What is the charge on the fixed particle?

$-2\mathrm{.}2C$

$+6\mathrm{.}7C$

$-2\mathrm{.}7C$

$+8\mathrm{.}0C$

$-1\mathrm{.}1C$