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: Force on hitting ground

  1. Jul 11, 2015 #1
    1. The problem statement, all variables and given/known data
    A ball weighing 10g hit s ahard surface vertically with a speed of 5m/s and rebounds with the same speed.The ball remains in contact with the surface for 0.01 sec. The average force exerteed by the surface on the ball is :a) 100N b)10N c)1N d) 0.1N

    2. Relevant equations

    3. The attempt at a solution
    using F= M(v2-v1)/t. I subs the values and converted g to kg.I also took the initial velocity as 5m/s and final as zero, time =0.01 sec . But I am getting 5 N. Where is my understanding flawed?
  2. jcsd
  3. Jul 12, 2015 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Compare those two statements.
  4. Jul 12, 2015 #3
    oh...initial and final are same. 5-(-5)=10. Stupid me.Thank you sir.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted