1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Conversation of Energy/ I'm stuck

  1. Jul 9, 2013 #1
    1. The problem statement, all variables and given/known data
    a cannon is fired out of a cannon at a velocity of 28m/s and at an angle of 90°. Straight up. Assume it starts at a height of 0, figure out the max height it will reach. Air resistance is ignored.

    2. Relevant equations


    3. The attempt at a solution
    I'm not 100% on this but I think with conservation you can use the equation: mgh= 1/2mv^2
    I just need help setting it up I'm usually pretty good working it out. Thanks in advance.
     
  2. jcsd
  3. Jul 9, 2013 #2

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    You've already set it up correctly. Cancel the m and solve for h.
     
  4. Jul 9, 2013 #3
    How do you set it up without knowing mass?
     
  5. Jul 9, 2013 #4

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    Put the mass equal to 1kg. Solve it. Put the mass equal to 2kg. Solve it. You'll get the same answer. The mass doesn't matter. It cancels.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Conversation of Energy/ I'm stuck
  1. I'm stuck (Replies: 4)

Loading...