A particle 'm' starts with zero velocity along a line y = 4d. (Where d is a constant). The position of particle 'm' varies as x=A sin ωt. At ωt=π2 , its angular momentum with respect to the origin is?
At ωt=π2u=dxdt=Aω cos ωt=Aω cos(π2)=0
So the angular momentum about origin = 0.