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Homework Help: Please help with Motion of Two Rockets?

  1. Apr 12, 2010 #1
    Physics please help with Motion of Two Rockets?

    Two toy rockets are traveling in the same direction (taken to be the x axis). A diagram is shown of a time-exposure image where a stroboscope has illuminated the rockets at the uniform time intervals indicated.

    http://session.masteringphysics.com/problemAsset/1006902/29/1006902.jpg

    1) At what time(s) do the rockets have the same velocity?

    at time t = 1 only
    at time t = 4 only
    at times t = 1 and t = 4
    at some instant in time between t = 1 and t = 4
    at no time shown in the figure

    2) At what time(s) do the two rockets have the same acceleration?

    at time t = 1 only
    at time t = 4 only
    at times t = 1 and t = 4
    at some instant in time between t = 1 and t = 4
    at no time shown in the figure
    3) The motion of the rocket labeled A is an example of motion with uniform (i.e., constant) __________.

    and nonzero acceleration
    velocity
    displacement
    time

    4) The motion of the rocket labeled B is an example of motion with uniform (i.e., constant) __________.

    and nonzero acceleration
    velocity
    displacement
    time

    5) At what time(s) is rocket A ahead of rocket B?

    before t = 1 only
    after t = 4 only
    before t = 1 and after t = 4
    between t = 1 and t = 4
    at no time(s) shown in the figure
     
  2. jcsd
  3. Apr 12, 2010 #2

    collinsmark

    User Avatar
    Homework Helper
    Gold Member

    Hello 1man,

    What do you think? :smile:
     
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