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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

    haruspex

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    Compare those two statements.
     
  4. Jul 12, 2015 #3
    oh...initial and final are same. 5-(-5)=10. Stupid me.Thank you sir.
     
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