1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Collision calculation help

  1. Aug 11, 2004 #1
    I have a problem as follows:

    A rugby player, mass 120 kg is running due south at 6 m/s. He is tacked by an opponent, mass 90 kg, due east at 8 m/s. Calculate the combined speed of the joined players immediately after the tacke.

    I assume that

    m1*u1 + m2*u2 = (m1+m2)V

    is it right ?


  2. jcsd
  3. Aug 11, 2004 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    Dearly Missed

    True enough, but remember:
    1.There's no way but to treat the velocities as vectors here!
    2. You are asked for the SPEED, rather than the VELOCITY, so your final answer should be a scalar(number), not a vector
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook