A 5000kg rocket breaks into 2 equal pieces. The command module continues up into space at 300 m/s. The lower ejected part is shot backwards at 90m/s. What is the rockets initial velocity?

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Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.