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Q.

A block of mass ‘m’ moves on a horizontal rough surface with initial velocity ‘v’. The  height of the center of mass of the block is ‘h’ from the surface. Consider a point ‘A’ on  the surface of sliding 
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a

Torque of the forces acting on block is zero about A

b

Angular momentum of the block decreases during sliding 

c

Angular momentum is not conserved about A

d

Angular momentum about  ‘A’ is mvh initially 

answer is A, B, D.

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N does not pass through the centre

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