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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A uniform rod BC with length a is attached to a light string AC. End A of the string is fixed to the ceiling and the end B of the rod is on a smooth horizontal surface. B is exactly below point A and length AB is b(a<b<2a). The system is released from rest and the rod begins to slide. Find the speed of the centre of the rod when the string becomes vertical.

A uniform rod BC with length a is attached to a light string AC. End A of the string is fixed to the ceiling and the end B of the rod is on a smooth horizontal surface. B is exactly below point A and length AB is b(a<b<2a). The system is released from rest and the rod begins to slide. Find the speed of the centre of the rod when the string becomes vertical.

Average torque on a projectile of mass m initial speed u and angle of projection theta between initial and final positions P and Q as shown in the figure about the point of projection is