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1. How is a two-dimensional collision different from a one-dimensional collision? Explain, using examples.
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2. In your own words, state the law of conservation of momentum for twodimensional collisions. Show how the law relates to x and y components by using an example.
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3. In your own words, define the centre of mass of an object.
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4. Explain why scientists accepted the existence of the neutrino for so long when there was no direct evidence for it.
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