sentence: a british cooper 20 pound bomb used during wwi german wwii bombs : explosive to left , rest concrete practice bombs ( 250 kg and 50 kg ) royal air force '' grand slam '' bomb , early 1945 an f-100 super sabre of the 308th tfs , being loaded with mk 117 750 lb bombs at tuy hoa , south vietnam in 1966 modern jdam guided gbu-31 bombs an aerial bomb is a type of explosive weapon intended to travel through the air with predictable trajectories , usually designed to be dropped from an aircraft .