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: Projectiles - how high is the ball

  1. Feb 12, 2006 #1
    Can anyone help with these 2?

    I cant seem to figure out how to get the answer of 2.8m for this ...
    IF you throw a ball at an initial velocity of 26 m/s at an angle of 20 above the horizontal, how high above the projection point is the ball after 2.8 s?

    and also

    You drag a crat weighing 311 N across a floor by pulling on a rope attatched to the crate. You exert a force of 450N on the rope inclined at 38 degrees, and the floor exerts a horizontal force of 125 N, the acceleration is ....
    (do you add the forces, for total force? what do you do with the 38 degrees ?)
  2. jcsd
  3. Feb 12, 2006 #2


    User Avatar
    Homework Helper
    Gold Member

    For the first one, what have you done? Have you split the components of velocity along the x-axis and y-axis?

    For the second one, have you learned about the resolution of forces along the x and y directions.

    If you have a book, try reading some example problems. This is very basic stuff.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook