Explanation
Angular momentum is moment of momentum. So, angle goes on decreasing from 90o but the perpendicular distance to the line of motion remains constant. So , angular momentum is also constant.
Linear momentum will be zero as VCM is zero
By conservation of the angular momentum presence of external torque, the total angular momentum of the system is constant
When a couple acts on a body it donot produce any translator motion. So only rotational motion. So only rotational motion is produced
In a circular motion speed is constant and changes its direction at equal point. So, torque acting on a body is zero.
When a body rolls down , it suffers loss in gravitational potential energy provided, translational energy due to the frictional force is conserved into rotational energy
The acceleration of point A is constant in magnitude as well as direction. The combined translational and rotational motion as equal to pure rotation
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