$23\mathrm{.}46$ CP A point charge

$$

$1$

$=$

$+$

$5\mathrm{.}00$

$$

$$

C

is held fixed in space. From a horizontal distance of $6\mathrm{.}00$ cm$,$ a small sphere with mass

$4\mathrm{.}00$

$$

$10$

$$

$3$

$$

kg

and charge

$$

$2$

$=$

$+$

$2\mathrm{.}00$

$$

$$

C

is fired toward the fixed charge with an initial speed of

$40\mathrm{.}0$

$$

m

$/$

s

$.$ Gravity can be neglected. What$$is the acceleration of the sphere at the instant when its speed is$$

$25\mathrm{.}0$

$$

m

$/$

s

$?$