$[-/1$ Points$]$ SCALCET$93\mathrm{.}9\mathrm{.}035.$

A ladder $10$ ft long rests against a vertical wail. If the bottom of the ladder slides away from the wall at a rate of $1\mathrm{.}4f\frac{t}{s},$ how fast $($in rad$/$s$)$ is the angle $($in radians$)$ between the ladder and the ground changing when the the wall? $($That is$,$ find the angle's rate of change when the bottom of the ladder is $6$ ft from the wall.$)$

$ra\frac{d}{s}$

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