1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Momentum, throwing a ball

  1. Nov 3, 2009 #1
    1. The problem statement, all variables and given/known data
    A man is standing on a frozen pond (which is mean less).
    He throws a ball m=250 g
    The speed of the ball is 8.0 ms-1
    The man moves back at a speed of 0.05 ms-1
    How heavy is the man ?

    2. Relevant equations

    m1 x v1 = m2 x v2

    3. The attempt at a solution

    m1 v1 = m2 v2

    250 x 8 = m2 x 0.05
    2000 = 0.05 m2
    m2= 40000 [g] = 40 [kg]

    is this correct ?

  2. jcsd
  3. Nov 3, 2009 #2
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook