In the video Derek explains that the fluid jetpack withdraws water from the lake at a rate of 60 litres a second. It is then fired out of the nozzles at around 15 m/s creating 1800 N of force. A. How did Derek calculate the force above? Show the calculations necessary to achieve the same answers that he got and check his work! B. Would it be possible to create a similar jetpack using only air? Calculate the velocity of air required to generate the same lift force as the water jetpack if the diameter of the each of the nozzles is 10 cm and the density of air is 1.2 kg/m