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A nearly massless rod is pivoted at one end so that it can swing freely as a pendulum. Two masses 2m and m are attached to it at distance b and 3b respectively, from the pivot. The rod is held horizontal and then released. Find its angular acceleration at the instant it is released.

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2g11b

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5g11b

5g12b

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detailed solution

Correct option is C

M0=2mg.b+mg.3b=5mg.b I0=2m.b2+m.9b2=11mb2 ∴α = M0I0=5g11b.

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