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Problem $15\mathrm{.}110-$ Relative acceleration

The instant shown crank $\backslash ($ B C $\backslash )$ has a constant angular velocity of $42$ rpm clockwise.

Problem $15\mathrm{.}110.$b $-$ The acceleration of point D

Determine the acceleration of point $\backslash ($ D $\backslash ).$

The acceleration of point $\backslash ($ D $\backslash )$ isin$./\backslash (\backslash$mathrm$\{$s$\}^\{2\}\backslash )$

$\backslash (\backslash$boldsymbol$\{$x$\}^\{\backslash$circ$\}\backslash ).$