Consider the disk in $($Figure $).$ The angular acceleration

of the disk is defined by $=(3t^2+20)ra\frac{d}{s^2},$ where $t$

is in seconds. The disk is originally rotating at

${}_0=20ra\frac{d}{s}.$

Determine the magnitude of the velocity of point $A$ on the disk when $t=2s.$

Express your answer in meters per second to three significant figures.

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Part B

Determine the magnitudes of the $n$ and $t$ components of acceleration of point $A$ on the disk when $t=2s.$

Express your answers in meters per square second using three significant figures separated by a comma.

$(a_A{)}_n,(a_A{)}_t=$

$$

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Figure