Conservation of Momentum

[MedPR]

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http://www.wikipremed.com/01physicscards.php?card=200

Answer A is only true because when two objects collide the contact time is the same for both objects, right?

Also, are B and D also true statements?

 

[BB8730]

http://www.wikipremed.com/01physicscards.php?card=200

Answer A is only true because when two objects collide the contact time is the same for both objects, right?

Also, are B and D also true statements?

The contact time is the same but the forces on each object are also equal and opposite. In my opinion the more important point is that impulses have similar laws to forces and Newton's 3rd law applies.

B and D are also true I believe. a = F/m and Ki + Ui = Kf + Uf

edit: C is actually true as well. F = delta(p)/delta(t)

 

[ipodtouch]

They are all true statements, but only A answers the question