Par A is correct, all i need is part B

Its my last attemp

The mechanism produces intermittent motion of link $AB.$ The sprocket $S$ is mounted on a shaft which is separate from a collinear shaft attached to $AB$ at $A.$ The pin at $C$ is attached to one of the chain links such that it moves vertically downward. The sprocket $S$ is turning with an angular acceleration ${}_S=4ra\frac{d}{s^2}$ and has an angular velocity ${}_S=6ra\frac{d}{s}$ at the instant shown. $($Figure $1)$

Figure

$1$ of $1$

Part A

Determine the angular velocity of link $AB$ at this instant measured clockwise.

Express your answer in radians per second to three significant figures. Enter positive value if the angular velocity is clockwise and negative value if the angular velocity is counterclockwise.

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Correct

Here we learn how to determine the angular velocity of a link connected to rotating sprockets via a chain.

Part B

Determine the angular acceleration of link $AB$ at this instant measured clockwise.

Express your answer in radians per second squared to three significant figures. Enter positive value if the angular acceleration is clockwise and negative value if the angular acceleration is counterclockwise.

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