At an instant the link AB of length r has an angular velocity and an angular acceleration . What is the total acceleration of AB?

At an instant the link AB of length r has an angular velocity and an

1.	At an instant the link AB of length r has an angular velocity and an angular acceleration . What is the total acceleration of AB?
A.	[( <sup>2</sup>r)<sup>2</sup> + r)<sup>2</sup>]<sup>1/2</sup>
B.	[( r)<sup>2</sup> + r)<sup>2</sup>]<sup>1/2</sup>
C.	[( <sup>2</sup>r)<sup>2</sup> + r)]<sup>1/2</sup>
D.	[( <sup>2</sup>r)2 + r)<sup>2</sup>]<sup>1/2</sup>
Answer» B. [( r)<sup>2</sup> + r)<sup>2</sup>]<sup>1/2</sup>