Average Forces Question

  • Thread starter looi76
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Homework Statement


http://img100.imageshack.us/img100/1867/physicsp25wz8.png [Broken]

Use data from Figure to determine,
(a) the distance travelled by the ball during the first 0.40s,
(b) the change in momentum of the ball, of mass 45g, during contact of the ball with the surface,
(c) the average force acting on the ball during contact with the surface.

Homework Equations



The Attempt at a Solution


(a) 0.8m
(b) [tex]Change \ in \ momentum = mv - mu[/tex]
[tex]= (45 \times 10^{-3} \times 4.2) - (45 \times 10^{-3} \times 0)[/tex]
[tex]= 0.19Ns[/tex]

Answer in text book is [tex]0.35Ns[/tex], where did I go wrong?
 
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Answers and Replies

  • #2
Doc Al
Mentor
45,011
1,288
Where on the diagram does contact with the surface begin and end?
 

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