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!

Energy - Work/velocity problem

  1. Sep 28, 2004 #1
    Original Question: A person doing a chin-up weighs 700N exclusive of the arms. During the first 25.0 cm of the lift, each arm exerts an upward force of 355N on the torso. If the upward movement starts from rest, what is the persons velocity at the point.

    some work:
    700-2(355) = 10 N
    W = 25 cm *10 N
    .25M*10N= 2.5 J
    (Mass ~ 700N = 9.8[M] )
    A = 2.5 / 71.4
    =.035 m/s

    My question: so what do I do now with this .035 m/s?
  2. jcsd
  3. Sep 28, 2004 #2


    User Avatar
    Homework Helper

    Try using [tex] W = \Delta K [/tex]
  4. Sep 28, 2004 #3
    You could also find acceleration using [itex]F_{net}=ma[/itex] then use kinematic formulas to find final velocity.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Energy - Work/velocity problem
  1. Energy and Velocity (Replies: 8)