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Second derivative is negative

> How can anything slow at a rapid pace?

Rapid deceleration. Just because a car is still moving, doesn't mean it's moving as fast as it was 1 second ago.

I think in this case it’s supposedly still accelerating but you are depressed the gas and the engine is spooling back down to idle. I think the term is Jerk

Imagine a car slamming on anti lock brakes versus one coasting to a stop.