A pendulum in $($Figure $1)$ has a swinging motion such that $=[-0\mathrm{.}101sin(4\mathrm{.}15t)+0\mathrm{.}3cos(4\mathrm{.}15t)]rad,$ where $t$ is in seconds, and the arguments for the sine and cosine are in radians. Assume $L=0\mathrm{.}2m.$

Part A

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

Express your answer to three significant figures and include the appropriate units

$v=$ Value

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Part B

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

Express your answer to three significant figures and include the appropriate units.

$a=$

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