Problem

A point charge

q_1 = 9.1 \mu\text{C}

is held fixed at origin. A second point charge

q_2 = -0.42 \mu\text{C}

and a mass

3.2 \times 10^{-4} \text{ kg}

is placed on the

x

-axis,

0.96 \text{ m}

from the origin. The second point charge is released at rest. What is its speed when it is

0.24 \text{ m}

from the origin?