英语翻译A jet of water from a 25mm diameter nozzle is directed v

英语翻译
A jet of water from a 25mm diameter nozzle is directed vertically upward.Assuming that the jet remains circular and neglecting any loss of energy,what will be the diameter of the jet at a point 4.5m above the nozzle if the velocity with which the jet leaves the nozzle is 12m/s?