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Homework Help: Force on ball at an angle

  1. Oct 19, 2015 #1


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    1. The problem statement, all variables and given/known data

    a mass of 100g strikes the wall with speed 5 m/s at an angle of 60 degrees to the wall and it rebounds with the same speed. if the contact time is 2 * 10^ -3 , what is the force applied by the wall and in what direction?

    3. The attempt at a solution

    I tried solving the question by using the wall as the y axis and finding the acceleration along the y component of the velocity..
    but I come up with the answer 250 which is wrong
    the correct answer is 250 * underoot 3 and the direction is given to the left please explain how

    thanks in advance
  2. jcsd
  3. Oct 19, 2015 #2


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    Hello scary one,

    You may assume there is no force (so no acceleration) in the y direction: the ball appears to bounce off with the same speed.

    In the x-direction, however, drastic things happen: first it moves at some speed towards the wall and after the bounce it has the same speed but in a negative x direction. So there is a big ##\Delta v##. Your job is to calculate a from that with the relevant formula (oops :wink: )
  4. Oct 19, 2015 #3


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    thanks bvu.
    I got it right now.
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