A semi circular disc start rotating (at `t=0` ) with constant angular acceleration `alpha=2 rad / (s)^(2)` about axis `O` as shown in figure. Mass and radius of semi-circular disc are `5 kg` and `2 pi m` respectively. Magnitude of linear momentum of disc at `t=3 s( in kg m /s) is
'(##CEN_KSR_PHY_JEE_C09_E01_013_Q04##)'

Answer

80