A mass of 40 kg is held in position in a length of 125 mm diameter tube by a pin-see figure. Below this mass is a volume of 15 liters of steam at 5 MPa, 400°C. The pin is released and the mass is accelerated upwards, leaving the top of the tube with a certain velocity. If the steam undergoes a reversible adiabatic expansion, until a pressure of 600 kPa is reached, what is the exit velocity of the mass?