Conservation of momentum
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If two objects collide and one is initially at rest, answer the following (ignore any frictional effects):
a) Is it possible for both of them to be at rest after the collision?
b) Is it possible for one of them to be at rest after the collision?
c) Under what condition is their total energy conserved?
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Qualitative answers about the properties of momentum are provided in this solution.
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a) No. If both of them are at rest after the collision, the total momentum is zero. Since initially there was a non-zero momentum (one object was moving) this will break the conservation of momentum principle.
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