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: Physic Problem!

  1. Jan 11, 2009 #1
    A 250 pound basketball player pushes against the floor with an additional force of 30 pounds in order to accelerate upwards after the rebound. The floor exerts a force back upon the player of ______

    A) 30 pounds
    B) 220 pounds
    C) 250 pounds
    D) 280 pounds
    E) not enough info to tell


    I think it is D because wouldn't you need the same force?

    pleasee help mee :)
     
    Last edited by a moderator: Jan 11, 2009
  2. jcsd
  3. Jan 11, 2009 #2

    Hootenanny

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Welcome to Physics Forums.

    You are indeed correct. The Baseball player exerts a total force of 280 pounds (250 pounds from his weight and an additional 30 pounds to accelerate upwards), hence by Newton's 3rd law the ground must exert a force of equal magnitude on the player.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook