Practice Problem #1.  Suppose your rocket has an empty mass of 110g.  You add 450ml of water.  Water begins leaving your rocket at a time of 3.15s.  At this time, your rocket's velocity is approximately 4m/s.  The last bit of water leaves your rocket a time of 3.72s, and at that time your rocket's velocity has reached 35m/s.  What is your rocket's average force of thrust over this time period? Practice Problem #2.  Suppose your rocket has an empty mass of 95g.  You add 300ml of water.  Water begins leaving your rocket at a time of 1.64s.  At this time, your rocket's velocity is approximately 2m/s.  The last bit of water leaves your rocket a time of 2.58s, and at that time your rocket's velocity has reached 50m/s.  What is your rocket's average force of thrust over this time period?