Quote:
Originally Posted by SandraM
hey...
just cant get this one CAPA question and was wondering if someone on here could help me.
Thanks soo much in advance 
A 69.0 g tennis ball with an initial speed of 26.0 m/s hits a wall and rebounds with the same speed. The figure below shows the force of the wall on the ball during the collision. What is the value of Fmax, the maximum value of the contact force during the collision, if the force is applied for ti=20.4 ms?
http://s1141.photobucket.com /album...nt= Graph.png
Graph:
http://s1141.photobucket.com /album...nt= Graph.png |
Have you tried equating momentum with impulse?
So deltaP = mv = integral of Force x time
mv/time = Force (Average)
(69/1000)(26)/(20.4/1000)=Force?
~70*26/20 ~ 7*26/2~7*13ish
who knows
