(Answered) A weightless rod of length 2l carries two equal masses m

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A weightless rod of length 2l carries two equal masses 'm', one tied at lower end A and the other at the middle of the rod at B. The rod can rotates in vertical plane about a fixed axis passing though C. The rod is released from rest in horizontal position. The speed of mass B at the instant , rod become vertical is

(1) square(3gl/5)

(2) square(4gl/5)

(3) square(6gl/5)

(4) square(7gl/5)

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