A pendulum in $($Figure $1)$ has a swinging motion such that $=[0\mathrm{.}101$sin$(4\mathrm{.}95$t$)+0\mathrm{.}3$cos$(4\mathrm{.}95$t$)]$rad$,$ where t is in seconds, and the arguments for the sine and cosine are in radians. Assume L $=0\mathrm{.}4$ m$.$

v $=0\mathrm{.}627$ m$/$s

Determine the magnitude of the acceleration of the bob when $=0.$