Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    Astronuc

    User Avatar
    Staff Emeritus
    Science Advisor

    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.

    http://hyperphysics.phy-astr.gsu.edu/hbase/mot.html#mot5

    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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook