A uniform solid disc is rolling on a horizontal surface. At a certain instant B is the point of contact and A is at height 2R from ground, where R is radius of disc:

L→=r→×MV→cm+IcmωLB=mvR+12mR2ω                (v=rω)LB=32mvRLA=−mvR+12mR2ω⇒12mvR∴ LB=3LA′As  LA=−ve          i.e., in (ACW) direction        LB=+ ve         i.e., in (CW) direction