Three charges are fixed to an $xy$ coordinate system. A charge of $+14C$ is on the $y$ axis at $y=+2\mathrm{.}5m.$ A charge of $-9\mathrm{.}9C$ is at the origin. Lastly, a charge of $+45C$ is on the $x$ axis at $x=+2\mathrm{.}5m.$ Determine $($ a $)$ the magnitude and $($ b $)$ direction of the net electrostatic force on the charge at $x=+2\mathrm{.}5m.$ Specify the direction as a positive angle relative to the $+x$ axis.

$($a$)$ Number

Units

$($b$)$ Number

Units