(a) A 50 cm x 50 cm x 1 m rectangular cross section garbage bin is found in the morning tipped over due to high wind the night before. If the density of the air, the density of the garbage bin and the drag coefficient of the garbage bin are 1.25 3 kg/m3, 150 kg/m, 2.2 respectively, determine the wind velocity at that night. (b) Based on question (ii)(a), if the wind speed on that night is 25 m/s, how much mass should be placed in the garbage bin to prevent the garbage bin from tip over.