(1)mgr=mvB^2/2
VB^2=2gr=2X10X0.2=4
VB=2m/s
FB-mg=mVB^2/r
FB=3mg=3X0.1X10=3N
(2)a=-umg/m=-ug=-0.5X10=-5m/s^2
V^2-VB^2=2ax
x=-4/(-2X5)=0.4m
(1)mgr=mvB^2/2
VB^2=2gr=2X10X0.2=4
VB=2m/s
FB-mg=mVB^2/r
FB=3mg=3X0.1X10=3N
(2)a=-umg/m=-ug=-0.5X10=-5m/s^2
V^2-VB^2=2ax
x=-4/(-2X5)=0.4m