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Homework Help: Just need someone to double check

  1. Jan 28, 2008 #1
    Could anyone please double check my answers to each of the following statements. Thanks

    1. The problem statement, all variables and given/known data

    Determine which of the following moving objects obey the equations of projectile motion.

    True A stone is thrown under water.
    True A ball is thrown in an arbitrary direction.
    True A jet airplane crosses the sky with its engines thrusting the plane forward.
    True A rocket moves through the sky after its engines have failed.
    False A rocket leaves the launch pad.
  2. jcsd
  3. Jan 28, 2008 #2


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    Not all your answers are correct, even when air resistance is neglected (which should have been stated in the problem). Hint: There is only one force acting on an object in ideal projectile motion problems. What is that force? How does it affect your answers?
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