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Homework Help: Dont know where to start

  1. Oct 21, 2007 #1
    Calculate the force exerted on a rocket, given that the propelling gases are expelled at a rate of 1200 kg/s with a speed of 39700 m/s (at the moment of takeoff).

    DO i just multiply? do i have to take gravity into consideration?
  2. jcsd
  3. Oct 21, 2007 #2
    Use conservation of energy along with Newton's third law.
  4. Oct 21, 2007 #3
    so i muliply 1200 and 39700 to get the reaction force , that equals 47,640,000. Is that my answer
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