Acceleration of Beam with Inertia

[tdoyzz]

A rod of length 57.0 cm and mass 1.40 kg is suspended at each end by a 44.0 cm string. The string on side B is cut. Find the magnitude of the initial acceleration of end B.
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l l
l l
_l_______________ l_
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A BF=ma, I=mL^2/3Would both rotational and translational energy be applied? I really have no clue where to start

 

[tdoyzz]

B is supposed to be on the right side of the beam, both have equal lengths