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A car manufacturer advertises that the brakes are so perfect that when applied, the car would stop instantaneously. Comment on this.



This is not possible.
We know that change in momentum = Impulse = Force * Δtime
Now if the car was to stop instantaneously, Δt  = 0, which means the force will have to be ∞ to cause the required change in momentum. To create ∞ force is not possible
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