Suppose you are traveling in a minivan at highway speeds and the momentum of an unlucky bug is suddenly changed as it splatters onto your windshield. Although the momentum of the van is very large compared to the momentum of the bug, the change in momentum of the van compared to the change in the bug is:.

- 1

Explanation:

Let p₁, p₂ represent the initial momentum of the bug and minivan and p₃, p₄ represent the final momentum of the bug and minivan.

From the law of conservation of momentum,

p₁ + p₂ = p₃ + p₄     p₃ =0 since the bug stops.

So, p₄ = p₁ + p₂

The change on momentum of the van is p₄ - p₂ = p₁ + p₂ - p₂ = p₁

The change on momentum of the bug = p₃ - p₁ = 0 - p₁ = - p₁

The change on momentum of the van compared to the change on momentum of the bug is  p₁/- p₁ = - 1.

So, the change in momentum of the minivan is negative of the change in momentum of the bug.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me