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  What is the momentum of cart A just before the collision?

  What is the momentum of cart A just before the collision?
(A) 1.5 kg m/s
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 08. Momentum

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Posted: 02/04/2013 03:01
Why we don't have count the mass of A in this question
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Posted: 02/04/2013 20:04
Adel, thanks for using the app. If you read the explanation, actually we did count when adding the momentum imparted by the force for 2s. But since A is originally at rest, v=0 and mv = 0. So the resulting momentum of cart A is coming only from F *∆t =3N * 2s, or 6kg m/s.
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