A stick of mass 9.5 kilogram and length 3.3 meter is pinned at its center but is free to rotate (the moment of inertia of only the stick about its center equals 1/12mL2). A mass of 4.2 kilogram is attached to one end of the stick. If you hold up the end with the mass above the horizontal therefore that the stick makes an angle θ = 20.4o with the vertical, Find the angular acceleration of the stick right after you let it go from that angle?