Question

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. torque of the forces acting on block is zero about `A`
D. angular momentum is not conserved about `A`.

Answer 1

Correct Answer - A::B::D

(A) Angular momentum about `A` is `mvh` initially
(B) Due to friction velocity of block decrease with time
( C) Since angular momentum about `A` decreases so torque of forces is not zero about `A`
(D) Angular momentum is not conserved about `A`.