All weighs a pound. So all will weigh the same
Not sure what a ponud is but 9 pounds is approx 0.0041 tons.
It is equal to 0.45 kilograms approximately. Kilogram is the metric unit and pound is the imperial unit for mass. 1 Kilogram is 2.204 pounds. So we multiply pound by 0.4535 to get the equivalent kilograms.1 lb = 0.453592 kg