See the "top view" picture above. From the picture, we can get the x and z-component of length of the string.

From these two component, now we can use Pythagorean theorem to get the y-component of the string.

If it's rotated, it will also raise. Differentiate the equation above to get the relation of its angular velocity and raising velocity. It'll result:

Now, we can write the equation of its energy.

Substitute all and to and , become

Substitute and solve for , resulting:

and

The acceleration at point A contains of angular acceleration and raising acceleration.

Substitute all variables above, and it will result:

That's my solution. If you have any correction, question, or comment, please leave a comment below.

Thank you. :-)

Substitute and solve for , resulting:

The acceleration at point A contains of angular acceleration and raising acceleration.

Substitute all variables above, and it will result:

That's my solution. If you have any correction, question, or comment, please leave a comment below.

Thank you. :-)

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