[Obama08]

[align=left]بسم الله الرحمن الرحيم

1.when the ball contact over along time, more impulse will be generated ;
Implulse = force*Time , since impulse = change in momentum
the momentum is getting bigger and then impart more speed to the ball

2. the greatest change in momentum in C

3. in a perfectly elastic collision apply conservation of momentum and conservation of energy (kinetic).[/align]



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