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: Impulse Problem, Any Help Appreciated

  1. Nov 12, 2007 #1
    A 75 kg man is sitting in his car at rest at the stoplight. He is rear-ended by another car and is accelerated to 3.0 m/s in 0.2s. What is the impulse on the man and his car?

    I found the impuse on the man which was:

    I = m(change v)

    = 75(3.0 -0)
    = 225 Ns

    I found the Net force on the man:

    Fnet = 225/change in time
    =225/0.2s
    =1125N

    I also found acceleration which is 15 m/s^2

    I'm stumped because I can't find a way to find the impulse of the man and the car without needing the mass of the car. Any help would be highly appreciated.

    Thank you
     
  2. jcsd
  3. Nov 12, 2007 #2
    are those the exact words of the problem?

    perhaps the answer is in terms of m?
     
    Last edited: Nov 12, 2007
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook