A disc of mass 'm' and radius 'R' is rotating with angular speed ω₀ and speed zero as shown and then placed on a rough surface (coefficient of friction=μ) and left. Then

Select all that apply

• Option A

  angular momentum of disc is conserved about point Q.

• Option B

  angular momentum of disc is conserved about point P on the ground.

• Option C

  initially the force of friction is μmg leftward.

• Option D

  initially the force of friction is μmg rightward.