A block of mass m moves on a horizontal rough surface with initial velocity v . height of centre of

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6.System of Particles and Rotational Motion

hard

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

A

angular momentum about $A$ is mvh initially

B

the velocity of the block decreases at time passes.

C

angular mometum is not conserved about $A.$

D

All of the above

Solution

Angular momentum about $A$ is $m v h$ initially

Due to friction velocity of block decrease with time

Angular momentum is not conserved about $A .$

Standard 11

Physics

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