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`        proof of conservation of momentum? please answer fast tommorow is my exam `
one year ago

```							First off momentum = mass x velocity. You can prove the conservation of momentum (i.e. that it stays the same unless a force acts upon a body) from Newton's laws.Force = mass x accelerationAcceleration is the change of velocity over time so:Force = mass x ((velocity1 - velocity2) / time)Or:Force = ((mass x velocity1) - (mass x velocity2)) / timeBecause mass x velocity is momentum, we can say:Force = (momentum1 - momentum2) / timeOr:Force x time = momentum1 - momentum2Meaning a change in momentum is caused by force multiplied by time. If there is no force (or no time for it to be applied), the left hand side of the equation is zero, meaning momentum1 = momentum2 (and therefore there is no change in momentum).Therefore, without a force being applied for a period of time, momentum is conserved.
```
one year ago
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