A mass m is connected to a massless rod ...

A mass m is connected to a massless rod of length l( and is free to rotate in vertical plane about hinged end of rod. If rod is released from horizontal position and mass "m" collides inelastically at lowest position with identical mass m, as shown in the figure, then the maximum height attained by combined mass will be

l/4

l/2

3l/4

l/8

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