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Homework Help: Ballistic Motion using Newton's Laws

  1. Nov 3, 2007 #1
    A rocket-powered hockey puck has a thrust of 1.20 and a total mass of 1.50 . It is released from rest on a frictionless table, 3.20 from the edge of a 3.60 drop. The front of the rocket is pointed directly toward the edge. How far does the puck land from the base of the table?

    Okay, so I found the accleration of the puck in the x-direction to be 0.8m/s/s and the difference in time between the moment it is at the end of the table to be 0.857s. But past this I have been unable to find initial velocity or final velocity or anything that I could plug into a kinematics equation to help me find the final position of the puck, on the x-axis.
  2. jcsd
  3. Nov 3, 2007 #2


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    One should include units, but it appears one is using SI or mks.

    and accelerates at 0.8 m/2 over a distance of 3.2 m.


    The puck then falls 3.6 m under the influence of gravity with no initial vertical velocity, but it has some horizontal velocity and perhaps horizontal acceleration(?).

    http://hyperphysics.phy-astr.gsu.edu/hbase/traj#tra11 [Broken]

    ref - http://hyperphysics.phy-astr.gsu.edu/hbase/traj.html
    Last edited by a moderator: May 3, 2017
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