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|Two carts A and B are identical in all respects. They roll down a hill and collide as shown in the figures at the right.
Figure (i): Cart A starts from rest on a hill at a height h above the ground. It rolls down and collides head-on with cart B which is initially at rest on the ground. The two carts stick together.
Figure (ii): Carts A and B are at rest on opposite hills at heights h/2 above the ground. They roll down, collide head-on with each other on the ground and stick together.
1. Which of the following statements are true about the two-cart system just before the carts collide in the two cases? Give all the statements that are true. If none are true, write N.
* Adapted from the ECS by Chandralekha Singh.
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