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Conservation of momentum

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1. https://575e9a4dda797652212934560b08...0Mechanics.pdf

https://575e9a4dda797652212934560b08...anics%20MS.pdf

First link is the question paper and the second link is the mark scheme. On the last part of question 59 on page 96 i don't understand what the mark scheme says (page 39). Please could someone help
2. (Original post by runny4)
https://575e9a4dda797652212934560b08...0Mechanics.pdf

https://575e9a4dda797652212934560b08...anics%20MS.pdf

First link is the question paper and the second link is the mark scheme. On the last part of question 59 on page 96 i don't understand what the mark scheme says (page 39). Please could someone help
The wall is anchored to the surface of the earth

What's happened is the momentum of the planet the wall is attached to has changed... but by an imperceptible amount because it's mass is very much greater than the mass of the car.
3. (Original post by Joinedup)
The wall is anchored to the surface of the earth

What's happened is the momentum of the planet the wall is attached to has changed... but by an imperceptible amount because it's mass is very much greater than the mass of the car.
thank you

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