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Homework Help: Acceleration of rocket?

  1. Jan 10, 2007 #1
    1. The problem statement, all variables and given/known data
    A rocket projected vertically upwards shows an observed/measured acceleration of 4m/s^2 in its motion.

    What is the upwards acceleration of the rocket caused by the fuel?

    2. Relevant equations
    gravity = 10m/s^2

    3. The attempt at a solution
    There is an acceleration of gravity acting on the rocket all the time so for it to show an acceleration of 4m/s^2, the internal engine must be making it to accelerate vertically upwards at 14m/s^2. Am I correct?
  2. jcsd
  3. Jan 10, 2007 #2


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    Staff Emeritus
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    Yesstupid text limit
  4. Jan 10, 2007 #3
    I thought so too as one can show using forces that in order to have a net force, the rocket must be providing 14m/s^2 acceleration. But the book claims the answer is 4m/s^2
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