Two identical carts A and B roll down a hill and collide as shown in the figure below.
i) A starts from rest. It rolls down and collides head-on with B which is initially at rest on the ground. The two carts stick together.
ii) A and B are at rest on opposite sides of the hill. They roll down, collide head-on and stick together.[/B]
Which statement is true about the two-cart system just after the carts collide in the two cases?
Select all that are True.
The momentum of the system is zero in case (ii).
The momentum of the system is the same in both cases (but no zero).
The momentum of the system is greater in case (ii) than in case (i).
The momentum of the system is greater in case (i) than in case (ii).
Conservation of Momentum[/B]
The Attempt at a Solution
I believe the answer is #1 and #4 are true. The momentum of the system is greater in case (i) than in case (ii) because case (i) is still moving unlike case (ii).
I believe the momentum is zero in case (ii) because it started from rest ad ended at rest[/B]
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