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A thin uniform rod of mass m and length l is free to rotate about its upper end.When it is at rest, it receives an impulse J at its lowest point, normal to its length. Immediately after impact a-the angular momentum of the rod is Jl b-the angular velocit of the rod is 3J/ml c-the kinetic energy of the rod is 3J^2/2m d-the linear velocity of the mid-point of the rod is 3J/2m
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