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Ok, we know that momentum is mass*velocity. To create a change we need to either change velocity or mass. This is where elastic and inelastic collision come into place. Rate of momentum changes in both collision cases.
To reduce the rate of change of momentum, even though this is a little vague, you'll need to reduce the changes in either mass or velocity. Such that the momentum at point A, for instance, reduces momentum at point B and then C and so forth (by constantly reducing velocity).
A live example is gas molecules, they have numerous collisions and the momentum constantly changes by variation in velocities. But remember the momentum of a system is conserved, that's a thing you'd probably need to know too to understand.
Hope that helps.
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How can you find the value of the impulse?
The value of an impulse is the change in momentum. If the mass remains constant it is the mass times the change in velocity.
Equation to find momentum?
Momentum is the product of Mass times Velocity Momentum = MV
How do you find mass if you are given the momentum and the speed?
momentum = mass x velocity => mass = momentum / velocity
Why do take derivative?
To find rate of change. Two common examples are: rate of change in position = velocity and rate of change of velocity = acceleration.
How do you find momentum?
p=m*v
